Issue 23005: Fix typos

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branch : 2.7
Issue #18028: Fix aliasing issue in READ_TIMESTAMP() of ceval.c  on x86_64,
when Python is configure with --with-tsc. Patch written by Christian Heimes.

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branch : 2.7
extra : amend_source : b5ce8b92bc0cc0a7c66cbfaaba97bb8eeee04eda
remove reference to dead irc channel (closes #23038)

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branch : 2.7
Backport of porting HOWTO

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branch : 2.7