QDoc: Changing "element" string to "type".

-QDoc output should use "type", not "element".
"This type was introduced..."

Change-Id: I72b6ba6318889d7727796b80574b72694f2b7594
Reviewed-by: Martin Smith <martin.smith@nokia.com>

src/tools/qdoc/generator.cpp

@@ -1786,7 +1786,7 @@ QString Generator::typeString(const Node *node)
     {
         switch (node->subType()) {
         case Node::QmlClass:
-            return "element";
+            return "type";
         case Node::QmlPropertyGroup:
             return "property group";
         case Node::QmlBasicType: