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help: explain in `hg help flags` that unambiguous prefixes are allowed

Authored by martinvonz.

Description

help: explain in hg help flags that unambiguous prefixes are allowed

I used hg commit --amend as an example because that's the most
frequently used flag I could think of that doesn't yet have a short
form.

Differential Revision: https://phab.mercurial-scm.org/D8607