[docs] [issue10796] Improve doc for readline.set_completer_delims()

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6137c46cb8df by Martin Panter in branch '2.7':
Issue #6953: Rearrange and expand Readline module documentation
https://hg.python.org/cpython/rev/6137c46cb8df

New changeset b1acd6cf15b6 by Martin Panter in branch '3.5':
Issue #6953: Rearrange and expand Readline module documentation
https://hg.python.org/cpython/rev/b1acd6cf15b6

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nosy: +python-dev

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