Remove note about doorway mode being saved/restored.

src/conio/cterm.txt

@@ -650,10 +650,6 @@ CSI ? [ p1 [ pX ... ] ] s
 	p1 is omitted, saves all such states.  If pX is included, saves only
 	the specified states (arguments to CSI ? l/h).
 
-	Note that currently, CSI ? s with no parameters will save the doorway
-        mode state, which can't be specified with a parameter (since it's set
-        using CSI = 255 h, not CSI ? 255 h).
-
 	SOURCE: SyncTERM only
 
 CSI s
@@ -672,10 +668,6 @@ CSI ? [ p1 [ pX ... ] ]  u
 	p1 is omitted, saves all such states.  If pX is included, restores
 	all the specified states (arguments to CSI ? l/h)
 
-	Note that currently, CSI ? u with no parameters will restore the
-	doorway mode state, which can't be specified with a parameter (since
-	it's set using CSI = 255 h, not CSI ? 255 h).
-
 	SOURCE: SyncTERM only
 
 CSI u