docs(how-tos): remove unnecessary constraints verification step

The constraints skip is an internal detail handled automatically by
`--multiple-versions`; users do not need to verify it manually.

Co-Authored-By: Claude <claude@anthropic.com>
Signed-off-by: Rohan Devasthale <rdevasth@redhat.com>

Author: rd4398

docs/how-tos/multiple-version-bootstrap.rst

@@ -138,13 +138,6 @@ Suppose you want to build every ``requests`` release from 2.28 onward.
    # requests-2.28.2-py3-none-any.whl
    # ...
 
-**4. Confirm constraints were skipped**
-
-.. code-block:: bash
-
-   ls work-dir/constraints.txt
-   # Expected: file does not exist
-
 If any version failed to build, the log output will include lines like:
 
 .. code-block:: text