Update for 3.1.5

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Changelog

 Entries are sorted chronologically from oldest to youngest within each release,
 releases are sorted from youngest to oldest.
 
-version <next>:
+version 3.1.5:
+- doc: fix various typos and grammar errors
+- avformat/utils: Update codec_id before using it in the parser init
+- cmdutils: fix typos
+- lavfi: fix typos
+- lavc: fix typos
+- tools: fix grammar error
+- ffmpeg: remove unused and errorneous AVFrame timestamp check
+- Support for MIPS cpu P6600
+- avutil/mips/generic_macros_msa: rename macro variable which causes segfault for mips r6
 
 version 3.1.4:
 - avformat/avidec: Check nb_streams in read_gab2_sub()

RELEASE

-3.1.4
+3.1.5

doc/Doxyfile

@@ -31,7 +31,7 @@ PROJECT_NAME           = FFmpeg
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 3.1.4
+PROJECT_NUMBER         = 3.1.5
 
 # With the PROJECT_LOGO tag one can specify a logo or icon that is included
 # in the documentation. The maximum height of the logo should not exceed 55