doc/APIchanges: fill in and correct some values

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

doc/APIchanges

@@ -284,7 +284,7 @@ API changes, most recent first:
 2014-05-11 - 14aef38 / 66e6c8a - lavu 52.83.100 / 53.14.0 - pixfmt.h
   Add AV_PIX_FMT_VDA for new-style VDA acceleration.
 
-2014-05-xx - xxxxxxx - lavu 52.82.100 - fifo.h
+2014-05-07 - 351f611 - lavu 52.82.100 - fifo.h
   Add av_fifo_freep() function.
 
 2014-05-02 - ba52fb11 - lavu 52.81.100 - opt.h
@@ -313,7 +313,7 @@ API changes, most recent first:
 2014-04-29 - 1bf6396 - lavc 55.60.100 - avcodec.h
   Add AVCodecDescriptor.mime_types field.
 
-2014-04-29 - xxxxxxx - lavu 52.80.0 - hash.h
+2014-04-29 - b804eb4 - lavu 52.80.100 - hash.h
   Add av_hash_final_bin(), av_hash_final_hex() and av_hash_final_b64().
 
 2014-03-07 - 8b2a130 - lavc 55.50.0 / 55.53.100 - dxva2.h
@@ -325,7 +325,7 @@ API changes, most recent first:
 2014-04-17 - a8d01a7 / 0983d48 - lavu 53.12.0 / 52.77.100 - crc.h
   Add AV_CRC_16_ANSI_LE crc variant.
 
-2014-04-XX - xxxxxxx - lavf xx.xx.1xx - avformat.h
+2014-04-15 - ef818d8 - lavf 55.37.101 - avformat.h
   Add av_format_inject_global_side_data()
 
 2014-04-12 - 4f698be - lavu 52.76.100 - log.h