Help: Revert "improve install() documentation of argument ordering"

Revert commit f09fda97d8 (Help: improve install() documentation of
argument ordering, 2018-01-08, v3.11.0-rc1~126^2).  Although the
example it added is correct, its explanation is misleading.
Revert it to make room for an alternative.

Issue: #25144
Issue: #16362