Fix typo

Change-Id: I5bacb30918f72d8b6a992c88a209b30647303177
Reviewed-on: https://gerrit.libreoffice.org/71031Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

forms/source/component/entrylisthelper.hxx

@@ -179,7 +179,7 @@ namespace frm
 
         /** refreshes our list entries
 
-            In case we have an external list source, its used to obtain the new entries, and then
+            In case we have an external list source, it's used to obtain the new entries, and then
             stringItemListChanged is called to give the derived class the possibility to
             react on this.