[x265] [PATCH 6 of 7] docs: make the --b-adapt docs less embarrasingly bad

[Steve Borho]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1427386978 18000
#      Thu Mar 26 11:22:58 2015 -0500
# Node ID 6c9e3e8f8ec6fa86ab8fcea0712d31ead6003753
# Parent  a5d8c3dba996330eb222758f9811f7bedae49ecf
docs: make the --b-adapt docs less embarrasingly bad

diff -r a5d8c3dba996 -r 6c9e3e8f8ec6 doc/reST/cli.rst
--- a/doc/reST/cli.rst	Thu Mar 26 11:18:55 2015 -0500
+++ b/doc/reST/cli.rst	Thu Mar 26 11:22:58 2015 -0500
@@ -970,9 +970,16 @@
 
 .. option:: --b-adapt <integer>
 
-	Adaptive B frame scheduling. Default 2
+	Set the level of effort in determining B frame placement.
 
-	**Values:** 0:none; 1:fast; 2:full(trellis)
+	With b-adapt 0, the GOP structure is fixed based on the values of
+	:option:`--keyint` and :option:`--bframes`.
+	
+	With b-adapt 1 a light lookahead is used to choose B frame placement.
+
+	With b-adapt 2 (trellis) a viterbi B path selection is performed
+
+	**Values:** 0:none; 1:fast; 2:full(trellis) **default**
 
 .. option:: --bframes, -b <0..16>