doc/filters: move aphaser to right(audio) chapter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

doc/filters.texi

@@ -792,6 +792,40 @@ Pass the audio source unchanged to the output.
 Pad the end of a audio stream with silence, this can be used together with
 -shortest to extend audio streams to the same length as the video stream.
 
+@section aphaser
+Add a phasing effect to the input audio.
+
+A phaser filter creates series of peaks and troughs in the frequency spectrum.
+The position of the peaks and troughs are modulated so that they vary over time, creating a sweeping effect.
+
+A description of the accepted parameters follows.
+
+@table @option
+@item in_gain
+Set input gain. Default is 0.4.
+
+@item out_gain
+Set output gain. Default is 0.74
+
+@item delay
+Set delay in milliseconds. Default is 3.0.
+
+@item decay
+Set decay. Default is 0.4.
+
+@item speed
+Set modulation speed in Hz. Default is 0.5.
+
+@item type
+Set modulation type. Default is triangular.
+
+It accepts the following values:
+@table @samp
+@item triangular, t
+@item sinusoidal, s
+@end table
+@end table
+
 @anchor{aresample}
 @section aresample
 
@@ -6725,40 +6759,6 @@ following one, the permission might not be received as expected in that
 following filter. Inserting a @ref{format} or @ref{aformat} filter before the
 perms/aperms filter can avoid this problem.
 
-@section aphaser
-Add a phasing effect to the input audio.
-
-A phaser filter creates series of peaks and troughs in the frequency spectrum.
-The position of the peaks and troughs are modulated so that they vary over time, creating a sweeping effect.
-
-A description of the accepted parameters follows.
-
-@table @option
-@item in_gain
-Set input gain. Default is 0.4.
-
-@item out_gain
-Set output gain. Default is 0.74
-
-@item delay
-Set delay in milliseconds. Default is 3.0.
-
-@item decay
-Set decay. Default is 0.4.
-
-@item speed
-Set modulation speed in Hz. Default is 0.5.
-
-@item type
-Set modulation type. Default is triangular.
-
-It accepts the following values:
-@table @samp
-@item triangular, t
-@item sinusoidal, s
-@end table
-@end table
-
 @section aselect, select
 Select frames to pass in output.