[docs] [issue18423] Document limitations on -m

[Nick Coghlan]

Nick Coghlan added the comment:

The limitation noted in #18422 was specific to 3.3, as the missing API was added to NamespaceLoader in 3.4.

So the current documentation is accurate for recent versions of Python.

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nosy: +ncoghlan
resolution:  -> out of date
stage: needs patch -> resolved
status: open -> closed
versions: +Python 3.3 -Python 3.4, Python 3.5

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