doc/filters: use '|' instead of ':' in the documentation.

Using colons to separate the outdefs is deprecated. Switch to using '|'
to separate the list items.

Signed-off-by: Simon Thelen <ffmpeg-dev@c-14.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/filters.texi

@@ -1710,11 +1710,11 @@ The default is 0.707q and gives a Butterworth response.
 Mix channels with specific gain levels. The filter accepts the output
 channel layout followed by a set of channels definitions.
 
-This filter is also designed to remap efficiently the channels of an audio
+This filter is also designed to efficiently remap the channels of an audio
 stream.
 
 The filter accepts parameters of the form:
-"@var{l}:@var{outdef}:@var{outdef}:..."
+"@var{l}|@var{outdef}|@var{outdef}|..."
 
 @table @option
 @item l
@@ -1745,13 +1745,13 @@ avoiding clipping noise.
 For example, if you want to down-mix from stereo to mono, but with a bigger
 factor for the left channel:
 @example
-pan=1:c0=0.9*c0+0.1*c1
+pan=1c|c0=0.9*c0+0.1*c1
 @end example
 
 A customized down-mix to stereo that works automatically for 3-, 4-, 5- and
 7-channels surround:
 @example
-pan=stereo: FL < FL + 0.5*FC + 0.6*BL + 0.6*SL : FR < FR + 0.5*FC + 0.6*BR + 0.6*SR
+pan=stereo| FL < FL + 0.5*FC + 0.6*BL + 0.6*SL | FR < FR + 0.5*FC + 0.6*BR + 0.6*SR
 @end example
 
 Note that @command{ffmpeg} integrates a default down-mix (and up-mix) system
@@ -1774,25 +1774,25 @@ remapping.
 For example, if you have a 5.1 source and want a stereo audio stream by
 dropping the extra channels:
 @example
-pan="stereo: c0=FL : c1=FR"
+pan="stereo| c0=FL | c1=FR"
 @end example
 
 Given the same source, you can also switch front left and front right channels
 and keep the input channel layout:
 @example
-pan="5.1: c0=c1 : c1=c0 : c2=c2 : c3=c3 : c4=c4 : c5=c5"
+pan="5.1| c0=c1 | c1=c0 | c2=c2 | c3=c3 | c4=c4 | c5=c5"
 @end example
 
 If the input is a stereo audio stream, you can mute the front left channel (and
 still keep the stereo channel layout) with:
 @example
-pan="stereo:c1=c1"
+pan="stereo|c1=c1"
 @end example
 
 Still with a stereo audio stream input, you can copy the right channel in both
 front left and right:
 @example
-pan="stereo: c0=FR : c1=FR"
+pan="stereo| c0=FR | c1=FR"
 @end example
 
 @section replaygain