removal of lines that make problems with texi

Docs/manual.texi:
  removing lines that do not follow texi rules correctly.
  Hope Arjen can put this together properly ...

Docs/manual.texi

@@ -46924,14 +46924,6 @@ not yet 100% confident in this code.
 * News-3.23.0::                 Changes in release 3.23.0
 @end menu
 
-@node News-3.23.53, News-3.23.52, News-3.23.x, News-3.23.x
-@appendixsubsec Changes in release 3.23.53
-@itemize @bullet
-@item
-Changed behaviour that  IF(condition,column,NULL) returns column type
-@end itemize
-
-
 @node News-3.23.52, News-3.23.51, News-3.23.x, News-3.23.x
 @appendixsubsec Changes in release 3.23.52
 @itemize @bullet