rustdoc: Add brief and desc fields to constdoc

src/rustdoc/doc.rs

@@ -20,6 +20,8 @@ type moddoc = ~{
 type constdoc = ~{
     id: ast_id,
     name: str,
+    brief: option<str>,
+    desc: option<str>,
     ty: option<str>
 };
 

src/rustdoc/extract.rs

@@ -128,6 +128,8 @@ fn constdoc_from_const(
     ~{
         id: id,
         name: name,
+        brief: none,
+        desc: none,
         ty: none
     }
 }