Moved a News entry from the 3.23.53 section into the 3.23.52 section

and removed the 3.23.53 News section for now until 3.23.52 is officially
tagged.

Docs/manual.texi

@@ -46924,18 +46924,12 @@ 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
 @item
+Changed behaviour that @code{IF(condition,column,NULL)} returns column type
+@item
 Fixed  a security bug with empty db column in db table
 @item
 Changed initialisation of @code{RND()} to make it less predicatable.