issue #1115 update :Add a sentence or two about the benefits of using…

[RSzipper]

This PR updates the documentation to provide detailed guidance on using the configure cache (configure -C) for faster rebuilds. Specifically, it:

Adds a new section on configure -C in setup.rst, explaining its purpose, benefits, and best practices.
Updates extension-modules.rst to reflect relevant details on configuration caching for extension modules.
Includes instructions on clearing the configure cache to avoid potential build inconsistencies.
Why This Change?
A clean ./configure run can be time-consuming. Using the configure cache improves the edit-configure-build-test cycle efficiency.
Helps developers avoid unnecessary configuration steps, reducing build time and system resource usage.
Ensures contributors understand when to use or avoid caching to prevent misconfigurations.
Issue Reference
Closes #1115 – Add a sentence or two about the benefits of using configure cache.

Additional Notes
Follows Python’s documentation style guidelines.
Improves contributor experience by making the build process more efficient.
Includes a table and best practices for clarity.

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📚 Documentation preview 📚: https://cpython-devguide--1518.org.readthedocs.build/

[zware]

Please see the guidance on the use of generative AI.

[RSzipper]

Please see the guidance on the use of generative AI.

what shall i do to help me contribute here solving this issue and merging it?? what is the expected work sir please guide me