sphinx: remove lines from the end

As lines are removed, the `enumerate` indices are offset for
after-the-first removals. Iterate from the end instead.

Utilities/Sphinx/config/conf.py.in

@@ -293,7 +293,7 @@ def remove_common_doc(common_str, docstringlines):
     if common_str in docstring:
         #Remove the line with genstring
         dsl = list(docstringlines)
-        for num,line in enumerate(dsl):
+        for num,line in reversed(list(enumerate(dsl))):
             if common_str in line:
                 docstringlines.pop(num)