[issue8637] Add MANPAGER envvar to specify pager for pydoc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 820d21c97d66 by doko in branch 'default':
- Issue #8637: Honor a pager set by the env var MANPAGER (in preference to
https://hg.python.org/cpython/rev/820d21c97d66

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nosy: +python-dev

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