Turn \input, \include, and \verbatiminput into XInclude elements instead
of something ad-hoc.
diff --git a/Doc/tools/sgmlconv/docfixer.py b/Doc/tools/sgmlconv/docfixer.py
index 867ec50..c1ea970 100755
--- a/Doc/tools/sgmlconv/docfixer.py
+++ b/Doc/tools/sgmlconv/docfixer.py
@@ -615,7 +615,7 @@
 
 PARA_LEVEL_PRECEEDERS = (
     "setindexsubitem", "author",
-    "stindex", "obindex", "COMMENT", "label", "input", "title",
+    "stindex", "obindex", "COMMENT", "label", "xi:include", "title",
     "versionadded", "versionchanged", "declaremodule", "modulesynopsis",
     "moduleauthor", "indexterm", "leader",
     )