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[3.12] gh-117804: Document how to suppress PGO unprofiled source warnings (GH-117859) (#117912)

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Co-authored-by: Erlend E. Aasland <erlend@python.org>
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Doc/using/configure.rst
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@ -302,6 +302,15 @@ also be used to improve performance.
GCC is used: add ``-fno-semantic-interposition`` to the compiler and linker
flags.
.. note::
During the build, you may encounter compiler warnings about
profile data not being available for some source files.
These warnings are harmless, as only a subset of the code is exercised
during profile data acquisition.
To disable these warnings on Clang, manually suppress them by adding
``-Wno-profile-instr-unprofiled`` to :envvar:`CFLAGS`.
.. versionadded:: 3.6
.. versionchanged:: 3.10