fixes short form, better wording

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16218 b3059339-0415-0410-9bf9-f77b7e298cf2

DOCS/man/en/mplayer.1

@@ -7723,7 +7723,7 @@ This setting allows you to specify what priority to place on the use of
 B-frames.
 The higher the value, the higher the probability of B-frames being used
 (default: 0).
-Don't forget that B-frames usually are with higher quantizer therefore
+Do not forget that B-frames usually have a higher quantizer therefore
 aggresive production of B-frames may cause worse visual quality.
 .
 .TP