Update guardrails overview with Partner model details

[ManojNair]

Added information about guardrails for Partner and Community models and recommendations for enforcing Azure AI Content Safety.
This is a common ask from customers and needs to be addressed
https://learn.microsoft.com/en-in/answers/questions/5540350/how-to-remove-content-filter-for-non-openai-models

[prmerger-automator]

@ManojNair : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 4dcf9c2:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
articles/foundry/guardrails/guardrails-overview.md	⚠️Warning		Details

articles/foundry/guardrails/guardrails-overview.md

• Line 36, Column 217: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/azure/api-management/llm-content-safety-policy' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 36, Column 217: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/azure/api-management/llm-content-safety-policy' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[v-dirichards]

@ManojNair My apologies, resolving the merge conflict wiped your change.

Please feel free to re-commit your change.

[learn-build-service-prod]

Learn Build status updates of commit c365b20:

✅ Validation status: passed

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 9ed3d2a:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
articles/foundry/guardrails/guardrails-overview.md	⚠️Warning		Details

articles/foundry/guardrails/guardrails-overview.md

• Line 36, Column 219: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/azure/api-management/llm-content-safety-policy' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 36, Column 219: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/azure/api-management/llm-content-safety-policy' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.