remove unnecessary descriptions and align the variable naming with VVC draft.

doc/software-manual.tex

@@ -1077,7 +1077,7 @@ Specifies the value to use to derive the vps_max_layers_minus1 for layered codin
 \Option{CTUSize} &
 %\ShortOption{\None} &
 \Default{128} &
-Defines the CTU size (width and height) if QTBT is on.
+Defines the CTU size (width and height).
 \\
 
 \Option{MaxCUWidth} &
@@ -2375,10 +2375,10 @@ Enables or disables the use of Bi-prediction with CU-level Weights (BCW).
 Enables or disables the fast encoding of Bi-prediction with CU-level Weights (BCW).
 \\
  
-\Option{BIO} &
+\Option{BDOF} &
 %\ShortOption{\None} &
 \Default{false} &
-Enables or disables the use of bi-directional optical flow (BIO).
+Enables or disables the use of bi-directional optical flow (BDOF).
 \\
 
 \Option{LMCSEnable} &