doc: use a common authors.texi file blurb

Factorize.

doc/authors.texi

@@ -0,0 +1,11 @@
+@chapter Authors
+
+The FFmpeg developers.
+
+For details about the authorship, see the Git history of the project
+(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
+@command{git log} in the FFmpeg source directory, or browsing the
+online repository at @url{http://source.ffmpeg.org}.
+
+Maintainers for the specific components are listed in the file
+@file{MAINTAINERS} in the source code tree.

doc/ffmpeg-bitstream-filters.texi

@@ -22,6 +22,8 @@ bitstream level modifications without performing decoding.
 
 @include bitstream_filters.texi
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-bitstream-filters
@@ -31,10 +33,6 @@ bitstream level modifications without performing decoding.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavcodec(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye

doc/ffmpeg-codecs.texi

@@ -1105,6 +1105,8 @@ Set sample format audio decoders should prefer. Default value is
 @include decoders.texi
 @include encoders.texi
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-codecs
@@ -1114,10 +1116,6 @@ Set sample format audio decoders should prefer. Default value is
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavcodec(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye

doc/ffmpeg-devices.texi

@@ -39,6 +39,8 @@ for programmatic use.
 @include indevs.texi
 @include outdevs.texi
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-devices
@@ -48,10 +50,6 @@ for programmatic use.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavformat(3), libavdevice(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye

doc/ffmpeg-filters.texi

@@ -19,6 +19,8 @@ libavfilter library.
 
 @include filters.texi
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-filters
@@ -28,10 +30,6 @@ libavfilter library.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavfilter(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye

doc/ffmpeg-formats.texi

@@ -144,6 +144,8 @@ of -1 enables when required by target format.
 @include demuxers.texi
 @include muxers.texi
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-formats
@@ -153,10 +155,6 @@ of -1 enables when required by target format.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavformat(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye

doc/ffmpeg-protocols.texi

@@ -19,6 +19,8 @@ libavformat library.
 
 @include protocols.texi
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-protocols
@@ -28,10 +30,6 @@ libavformat library.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavformat(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye

doc/ffmpeg-resampler.texi

@@ -176,6 +176,8 @@ and 16, default value is 9.
 
 @c man end RESAMPLER OPTIONS
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-resampler
@@ -185,8 +187,6 @@ and 16, default value is 9.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libswresample(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
+
+@bye

doc/ffmpeg-scaler.texi

@@ -118,6 +118,8 @@ are floating point number values.
 
 @c man end SCALER OPTIONS
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-scaler
@@ -127,10 +129,6 @@ are floating point number values.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libswscale(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye

doc/ffmpeg-utils.texi

@@ -20,6 +20,8 @@ by the libavutil library.
 @include syntax.texi
 @include eval.texi
 
+@include authors.texi
+
 @ignore
 
 @setfilename ffmpeg-utils
@@ -29,10 +31,6 @@ by the libavutil library.
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavutil(3)
 @c man end
 
-@c man begin AUTHORS
-See Git history (git://source.ffmpeg.org/ffmpeg)
-@c man end
-
 @end ignore
 
 @bye