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gh-135805: Document the X option and env var for controlling thread-local bytecode (#135868)

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Document the X option and env var for controlling thread-local bytecode.
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Doc/using/cmdline.rst
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@ -669,6 +669,13 @@ Miscellaneous options
.. versionadded:: 3.14
* :samp:`-X tlbc={0,1}` enables (1, the default) or disables (0) thread-local
bytecode in builds configured with :option:`--disable-gil`. When disabled,
this also disables the specializing interpreter. See also
:envvar:`PYTHON_TLBC`.
.. versionadded:: 3.14
It also allows passing arbitrary values and retrieving them through the
:data:`sys._xoptions` dictionary.
@ -1302,6 +1309,16 @@ conflict.
.. versionadded:: 3.13
.. envvar:: PYTHON_TLBC
If set to ``1`` enables thread-local bytecode. If set to ``0`` thread-local
bytecode and the specializing interpreter are disabled. Only applies to
builds configured with :option:`--disable-gil`.
See also the :option:`-X tlbc <-X>` command-line option.
.. versionadded:: 3.14
Debug-mode variables
~~~~~~~~~~~~~~~~~~~~