Fix typo

Change-Id: I401b74b4c95bfe653509edb55ed042ff31398e5d
Reviewed-on: https://gerrit.libreoffice.org/50641Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

sc/inc/conditio.hxx

@@ -605,7 +605,7 @@ public:
 
     /**
      * Checks that all cond formats have a non empty range.
-     * Deletes empty cond formats. Optionall call rLink
+     * Deletes empty cond formats. Optionally call rLink
      * on the empty format before deleting it.
      * @return true if all cond formats were valid
      */