doc/filters: move "aformat" before "amerge".

doc/filters.texi

@@ -140,6 +140,32 @@ aconvert=u8:auto
 @end example
 @end itemize
 
+@section aformat
+
+Convert the input audio to one of the specified formats. The framework will
+negotiate the most appropriate format to minimize conversions.
+
+The filter accepts the following named parameters:
+@table @option
+
+@item sample_fmts
+A comma-separated list of requested sample formats.
+
+@item sample_rates
+A comma-separated list of requested sample rates.
+
+@item channel_layouts
+A comma-separated list of requested channel layouts.
+
+@end table
+
+If a parameter is omitted, all values are allowed.
+
+For example to force the output to either unsigned 8-bit or signed 16-bit stereo:
+@example
+aformat=sample_fmts\=u8\,s16:channel_layouts\=stereo
+@end example
+
 @section amerge
 
 Merge two audio streams into a single multi-channel stream.
@@ -190,32 +216,6 @@ amovie=input.mkv:si=5 [a5];
 [x3][a5] amerge" -c:a pcm_s16le output.mkv
 @end example
 
-@section aformat
-
-Convert the input audio to one of the specified formats. The framework will
-negotiate the most appropriate format to minimize conversions.
-
-The filter accepts the following named parameters:
-@table @option
-
-@item sample_fmts
-A comma-separated list of requested sample formats.
-
-@item sample_rates
-A comma-separated list of requested sample rates.
-
-@item channel_layouts
-A comma-separated list of requested channel layouts.
-
-@end table
-
-If a parameter is omitted, all values are allowed.
-
-For example to force the output to either unsigned 8-bit or signed 16-bit stereo:
-@example
-aformat=sample_fmts\=u8\,s16:channel_layouts\=stereo
-@end example
-
 @section anull
 
 Pass the audio source unchanged to the output.