Clarify update_analyzer sample docs

[anhtnt90dev]

Summary

• Clarify that update_analyzer only updates description and tags in the Content Understanding samples.
• Point users to begin_create_analyzer(..., allow_replace=True) for create-only analyzer properties such as models, field_schema, and config.
• Update the sample README key concepts to match the supported update behavior.

Addresses #45789.

Checks

• git diff --check
• python -m py_compile sdk/contentunderstanding/azure-ai-contentunderstanding/samples/sample_update_analyzer.py sdk/contentunderstanding/azure-ai-contentunderstanding/samples/async_samples/sample_update_analyzer_async.py

Note: I did not run the live samples because they require a Content Understanding endpoint and credentials.

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   REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING, AND EXCEPT FOR THE WARRANTIES
   EXPRESSLY STATED IN SECTIONS 3, 4, AND 6, THE SUBMISSION PROVIDED UNDER THIS AGREEMENT IS
   PROVIDED WITHOUT WARRANTY OF ANY KIND, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY OF
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   You later become aware that would make Your representations in this Agreement inaccurate in any
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   contributions may be maintained indefinitely and disclosed publicly, including Your name and other
   information that You submit with Your Submission.
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   the parties consent to exclusive jurisdiction and venue in the federal courts sitting in King County,
   Washington, unless no federal subject matter jurisdiction exists, in which case the parties consent to
   exclusive jurisdiction and venue in the Superior Court of King County, Washington. The parties waive all
   defenses of lack of personal jurisdiction and forum non-conveniens.
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    the parties relating to the subject matter hereof. This Agreement may be assigned by Microsoft.

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   discussing and improving that Project, but excluding communication that is conspicuously marked or
   otherwise designated in writing by You as “Not a Submission.”
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   associated comments and documentation.
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   Project. This Agreement covers any and all Submissions that You, now or in the future (except as
   described in Section 4 below), Submit to any Project.
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   Should You wish to Submit materials that are not Your original work, You may Submit them separately
   to the Project if You (a) retain all copyright and license information that was in the materials as You
   received them, (b) in the description accompanying Your Submission, include the phrase “Submission
   containing materials of a third party:” followed by the names of the third party and any licenses or other
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  the Submission and such derivative works, and to sublicense any or all of the foregoing rights to third
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  Your patent claims that are necessarily infringed by the Submission or the combination of the
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  import or otherwise dispose of the Submission alone or with the Project.
• Other Rights Reserved. Each party reserves all rights not expressly granted in this Agreement.
  No additional licenses or rights whatsoever (including, without limitation, any implied licenses) are
  granted by implication, exhaustion, estoppel or otherwise.

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   licenses. You represent that each of Your Submissions is entirely Your original work (except as You may
   have disclosed under Section 3). You represent that You have secured permission from Your employer to
   make the Submission in cases where Your Submission is made in the course of Your work for Your
   employer or Your employer has intellectual property rights in Your Submission by contract or applicable
   law. If You are signing this Agreement on behalf of Your employer, You represent and warrant that You
   have the necessary authority to bind the listed employer to the obligations contained in this Agreement.
   You are not expected to provide support for Your Submission, unless You choose to do so. UNLESS
   REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING, AND EXCEPT FOR THE WARRANTIES
   EXPRESSLY STATED IN SECTIONS 3, 4, AND 6, THE SUBMISSION PROVIDED UNDER THIS AGREEMENT IS
   PROVIDED WITHOUT WARRANTY OF ANY KIND, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY OF
   NONINFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
7. Notice to Microsoft. You agree to notify Microsoft in writing of any facts or circumstances of which
   You later become aware that would make Your representations in this Agreement inaccurate in any
   respect.
8. Information about Submissions. You agree that contributions to Projects and information about
   contributions may be maintained indefinitely and disclosed publicly, including Your name and other
   information that You submit with Your Submission.
9. Governing Law/Jurisdiction. This Agreement is governed by the laws of the State of Washington, and
   the parties consent to exclusive jurisdiction and venue in the federal courts sitting in King County,
   Washington, unless no federal subject matter jurisdiction exists, in which case the parties consent to
   exclusive jurisdiction and venue in the Superior Court of King County, Washington. The parties waive all
   defenses of lack of personal jurisdiction and forum non-conveniens.
10. Entire Agreement/Assignment. This Agreement is the entire agreement between the parties, and
    supersedes any and all prior agreements, understandings or communications, written or oral, between
    the parties relating to the subject matter hereof. This Agreement may be assigned by Microsoft.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Clarifies the limitations of update_analyzer in the Content Understanding samples/docs, and points users to begin_create_analyzer(..., allow_replace=True) for replacing create-only analyzer properties.

Changes:

• Update sample docstrings/comments to state only description and tags are updatable via update_analyzer.
• Add guidance for changing create-only properties via begin_create_analyzer with allow_replace=True.
• Update the samples README to reflect the same guidance.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
sdk/contentunderstanding/azure-ai-contentunderstanding/samples/sample_update_analyzer.py	Clarifies in-sample guidance on what update_analyzer can modify vs. what requires replace-create.
sdk/contentunderstanding/azure-ai-contentunderstanding/samples/async_samples/sample_update_analyzer_async.py	Same clarification as sync sample for async flow.
sdk/contentunderstanding/azure-ai-contentunderstanding/samples/README.md	Documents the update_analyzer limitation and replacement path in the samples index.