fix character case

kwiki/kwiki-plugins.txt

@@ -61,7 +61,7 @@ Kwiki::Cache
 #   Optional Authorization Extensions
 #Kwiki::PagePrivacy
 #Kwiki::User::Remote
-#Kwiki::Edit::RequireUsername
+#Kwiki::Edit::RequireUserName
 #Kwiki::AuthorOnlyPageEditing
 #Kwiki::Scode