Correct wxSizer::InsertSpacer() description.

Closes #11092.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61637 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/sizer.h

@@ -568,7 +568,7 @@ public:
 
     /**
         Inserts non-stretchable space to the sizer.
-        More readable way of calling wxSizer::Insert(size, size, 0).
+        More readable way of calling wxSizer::Insert(index, size, size).
     */
     wxSizerItem* InsertSpacer(size_t index, int size);