minor grammar fixes (from docs@python.org)

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#22613: document Cmd.cmdqueue (thanks Jacques Ducasse)

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#22613: minor other fixes in library docs (thanks Jacques Ducasse)

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#22613: fix several factual errors in builtin docs (thanks Jacques Ducasse)

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Backported the optimization of compiling charsets in regular expressions
(issue #19329).  This is needed to apply the patch from issue #17381.

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Issue #17381: Fixed ranges handling in case-insensitive regular expressions.

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Closes #22772: fix __ifloordiv__ and __itruediv__ docstring.

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