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

[Susan Sun]

Susan Sun added the comment:

Below two issues are fixed. 

* add See Also links to the modern docs from the legacy docs
* append the (Legacy) suffix in the 2.x docs

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keywords: +patch
nosy: +Susan Sun, ezio.melotti
Added file: http://bugs.python.org/file42148/issue26014.diff

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