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

[Ned Deily]

Ned Deily added the comment:

Thanks, Susan, for your suggested patch.  I expanded on it to address all of the issues Nick brought up and then some, such as also updating to the changed setuptools doc link.  Pushed for release in 2.7.12, 3.5.2, and 3.6.0.

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nosy: +ned.deily
resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed
versions: +Python 2.7, Python 3.5, Python 3.6

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