Docs: add standard external names to nitpick_ignore

[serhiy-storchaka]

Sphinx in the nitpick mode complains about standard C identifiers like "size_t", "LONG_MAX" and "errno". This can be solved individually by adding ! before the name, e.g. :c:data:`errno` or using literal text instead of semantic role, e.g. ``errno``. Although it does not solve complains about using types like size_t in function signature. Other way -- add them to the nitpick_ignore list in conf.py.

Linked PRs

• gh-106948: Add standard external names to nitpick_ignore #106949
• [3.12] gh-106948: Add standard external names to nitpick_ignore (GH-106949) #107060
• [3.11] gh-106948: Add standard external names to nitpick_ignore (GH-106949) #107061
• [3.12] gh-106948: Docs: Disable links for C standard library functions, OS utility functions and system calls (GH-107062) #107154
• [3.11] gh-106948: Docs: Disable links for C standard library functions, OS utility functions and system calls (#107062) #107157
• gh-106948: Add Doc/nitpick_ignore.yml config file #107278
• gh-106948: Update documentation nitpick_ignore for c:identifer domain #107295
• [3.12] gh-106948: Update documentation nitpick_ignore for c:identifer domain (GH-107295) #107297
• [3.11] gh-106948: Update documentation nitpick_ignore for c:identifer domain (#107295) #107299
• gh-106948: Doc config ignores more standard C functions #107301