Don't call AdjustPagebreak() in a loop, this seems useless

There doesn't seem to be any reason to call this function more than once
on the same cell as the existing implementations are idempotent and it's
difficult to see why this should ever not be the case.

interface/wx/html/htmlcell.h

@@ -198,19 +198,13 @@ public:
         Returns @true if pagebreak was modified, @false otherwise.
 
         @param pagebreak
-            position in pixel of the pagebreak.
+            position in pixels of the pagebreak.
 
         @param known_pagebreaks
             the list of the previous pagebreaks
 
         @param pageHeight
-            the height in pixel of the page drawable area
-
-        Usage:
-        @code
-        while (container->AdjustPagebreak(&p, kp, ph)) {}
-        @endcode
-
+            the height in pixels of the page drawable area
     */
     virtual bool AdjustPagebreak(int* pagebreak,
                                  const wxArrayInt& known_pagebreaks,