[docs] [issue26014] Guide users to the newer package install instructions

[Roundup Robot]

Roundup Robot added the comment:

New changeset 71fc5b246f5b by Ned Deily in branch '2.7':
Issue #26014: Guide 2.7 users to the new packaging documentation:
https://hg.python.org/cpython/rev/71fc5b246f5b

New changeset f5fd646b265b by Ned Deily in branch '3.5':
Issue #26014: Update 3.x packaging documentation:
https://hg.python.org/cpython/rev/f5fd646b265b

New changeset 7583d65da2ad by Ned Deily in branch 'default':
Issue #26014: merge from 3.5
https://hg.python.org/cpython/rev/7583d65da2ad

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nosy: +python-dev

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