issue #251 avoid potential clash between built-in and custom defined kinds like sections

ldoc/doc.lua

@@ -295,7 +295,9 @@ function File:finish()
             end
             item.display_name = display_name
             this_mod.section = item
-            this_mod.kinds:add_kind(display_name,display_name,nil,item)
+            -- the purpose of this little hack is to properly distinguish
+            -- between built-in kinds and any user-defined kins.
+            this_mod.kinds:add_kind(display_name,display_name..' ',nil,item)
             this_mod.sections:append(item)
             this_mod.sections.by_name[lookup_name:gsub('%A','_')] = item
          end

ldoc/tools.lua

@@ -108,7 +108,6 @@ function KindMap:add (item,items,description)
    local group = item[self.fieldname] -- which wd be item's type or section
    local kname = self.klass.types_by_tag[group] -- the kind name
    if not self[kname] then
-    -- print(kname,group,self.fieldname)
       self[kname] = M.type_iterator (items,self.fieldname,group)
       self.klass.descriptions[kname] = description
    end