doc/filters: re-edit notes on filtergraph escaping
authorStefano Sabatini <stefasab@gmail.com>
Fri, 24 Jan 2014 10:31:25 +0000 (11:31 +0100)
committerStefano Sabatini <stefasab@gmail.com>
Sun, 26 Jan 2014 17:06:39 +0000 (18:06 +0100)
commit68c5ba1f052f4d8e4fbff0d78d3c0d6a7a8fa7f1
tree2ded9f5043d3419ecc26925b6df85ae281231fef
parent599e629f88a0f182500372863e56dcea011de669
doc/filters: re-edit notes on filtergraph escaping

State the escaping rules more explicitly, reword various sentences and
drop confusing quoting example.

Should fix trac issue #3334.
doc/filters.texi