cosmetics: Reformat paragraphs and other cosmetic changes.

Originally committed as revision 18182 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/APIchanges

@@ -12,17 +12,18 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
-20090308 - r17869 - lavu 50.0.0  - AVFifoBuffer
-  av_fifo_init, av_fifo_read, av_fifo_write and av_fifo_realloc were dropped and replaced
-  by av_fifo_alloc, av_fifo_generic_read, av_fifo_generic_write and av_fifo_realloc2.
-  In addition, the order of the function arguments of av_fifo_generic_read were changed
-  to match av_fifo_generic_write.
-  The AVFifoBuffer/struct AVFifoBuffer may only be used in an opaque way by applications,
-  they may not use sizeof() or directly access members.
+2009-03-08 - r17869 - lavu 50.0.0  - AVFifoBuffer
+  av_fifo_init, av_fifo_read, av_fifo_write and av_fifo_realloc were dropped
+  and replaced by av_fifo_alloc, av_fifo_generic_read, av_fifo_generic_write
+  and av_fifo_realloc2.
+  In addition, the order of the function arguments of av_fifo_generic_read
+  were changed to match av_fifo_generic_write.
+  The AVFifoBuffer/struct AVFifoBuffer may only be used in an opaque way by
+  applications, they may not use sizeof() or directly access members.
 
-20090301 - r17682 - lavf 52.31.0 - Generic metadata API
-  This version introduces a new metadata API (see av_metadata_get() and friends).
-  The old API is now deprecated and shouldn't be used anymore. This especially
+2009-03-01 - r17682 - lavf 52.31.0 - Generic metadata API
+  Introduce a new metadata API (see av_metadata_get() and friends).
+  The old API is now deprecated and should not be used anymore. This especially
   includes the following structure fields:
     - AVFormatContext.title
     - AVFormatContext.author