update all trac links to use the trac subdomain

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/developer.texi

@@ -659,7 +659,7 @@ inclusion into a point release:
     Fixes a security issue, preferably identified by a @strong{CVE
     number} issued by @url{http://cve.mitre.org/}.
 @item
-    Fixes a documented bug in @url{https://ffmpeg.org/trac/ffmpeg}.
+    Fixes a documented bug in @url{https://trac.ffmpeg.org}.
 @item
     Improves the included documentation.
 @item
@@ -679,7 +679,7 @@ The release process involves the following steps:
     Ensure that the @file{RELEASE} file contains the version number for
     the upcoming release.
 @item
-    Add the release at @url{https://ffmpeg.org/trac/ffmpeg/admin/ticket/versions}.
+    Add the release at @url{https://trac.ffmpeg.org/admin/ticket/versions}.
 @item
     Announce the intent to do a release to the mailing list.
 @item

doc/issue_tracker.txt

@@ -24,7 +24,7 @@ a mail for every change to every issue.
 The subscription URL for the ffmpeg-trac list is:
 http(s)://ffmpeg.org/mailman/listinfo/ffmpeg-trac
 The URL of the webinterface of the tracker is:
-http(s)://ffmpeg.org/trac/ffmpeg
+http(s)://trac.ffmpeg.org
 
 Type:
 -----

libavcodec/qtrle.c

@@ -68,7 +68,7 @@ static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change)
      * line' at the beginning. Since we always interpret it as 'go to next line'
      * in the decoding loop (which makes code simpler/faster), the first line
      * would not be counted, so we count one more.
-     * See: https://ffmpeg.org/trac/ffmpeg/ticket/226
+     * See: https://trac.ffmpeg.org/ticket/226
      * In the following decoding loop, row_ptr will be the position of the
      * current row. */