Make texi2pod.pl look for section "AUTHORS" rather than "AUTHOR", as

the corresponding sections in the man page have been renamed that way.

Originally committed as revision 23493 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/texi2pod.pl

@@ -304,7 +304,7 @@ $sects{NAME} = "$fn \- $tl\n";
 $sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
 
 for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS EXAMPLES ENVIRONMENT FILES
-              BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
+              BUGS NOTES FOOTNOTES SEEALSO AUTHORS COPYRIGHT)) {
     if(exists $sects{$sect}) {
         $head = $sect;
         $head =~ s/SEEALSO/SEE ALSO/;