Add SHA1s to APIChanges for av_dump_format, av_parse_time and av_find_info_tag

Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>

doc/APIchanges

@@ -12,11 +12,11 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
-2011-02-16 - xxxxxxx - lavf  52.101.0 - avformat.h
+2011-02-16 - 09d171b - lavf  52.101.0 - avformat.h
                        lavu  52.39.0  - parseutils.h
-  Add av_ prefix to dump_format().
-  Replace parse_date() in lavf with av_parse_time() in lavu.
-  Move find_info_tag from lavf to lavu and add av_prefix to it.
+  * 610219a - Add av_ prefix to dump_format().
+  * f6c7375 - Replace parse_date() in lavf with av_parse_time() in lavu.
+  * ab0287f - Move find_info_tag from lavf to lavu and add av_prefix to it.
 
 2011-02-15 - lavu 52.38.0 - merge libavcore
   libavcore is merged back completely into libavutil