Update docbookxi.rnc

Suggestions:
docbook/docbook#232
docbook/docbook#233

schemas/docbook52/docbookxi.rnc

@@ -8504,7 +8504,7 @@ div {
   db.html.tr =
 
     ## A row in an HTML table
-    element tr { db.html.tr.attlist, (db.html.th | db.html.td)+ }
+    element tr { db.html.tr.attlist, db.anchor?, (db.html.th | db.html.td)+ }
 }
 div {
   db.html.th.attlist =
@@ -10616,6 +10616,7 @@ div {
       db.modifier*,
       db.methodname?,
       ((db.methodparam | db.group.methodparam)+ | db.void?),
+      db.modifier*,
       db.exceptionname*,
       db.synopsisinfo*
     }