Document wxWindow::HitTest().

This is not a very useful method, but by providing at least some documentation
for it, we prevent it from inheriting the docs for the next method, which have
nothing to do with it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77751 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/window.h

@@ -3259,7 +3259,19 @@ public:
     */
     //@{
 
+    /**
+        Return where the given point lies, exactly.
+
+        This method is used to test whether the point lies inside the client
+        window area or on one of its scrollbars.
+
+        The point coordinates are specified in client window coordinates.
+     */
     wxHitTest HitTest(wxCoord x, wxCoord y) const;
+
+    /**
+        @overload
+     */
     wxHitTest HitTest(const wxPoint& pt) const;
 
     /**