Fix pattern section in doc

[RizThon]

The pattern section may need to be fixed
http://www.selenic.com/mercurial/hg.1.html#patterns
If I try the patterns from the page (eg path:foo/bar), I get a "Parse Error:
syntax error" (at least that's what TortoiseHg tells me).

But if I look at http://www.selenic.com/mercurial/hg.1.html#revsets and try
the patter (eg file('hgext/*')), it works.
The name of the files in the samples from
http://www.selenic.com/mercurial/hg.1.html#patterns should be inside single
quotes.
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