[PATCH] hgrc.5.txt: Describe the encode/decode filter semantics and the command "!"

[timeless]

Mark Hammond wrote:
> The above implies to me that if a file matches multiple patterns, all
> patterns are applied.  My understanding is that only one filter is
> applied - so the sentence above should say something closer to 'if a
> file matches multiple patterns, an arbitrary one is applied'.
>
> All of my debugging shows my interpretation to be correct - am I wrong?

heh. that doesn't sound like something to document w/o "BUG ### [we'll
fix this someday]".

I'm was only vouching for the sentence being understandable, not for
it being correct :).