Improve hover.

main.vala

@@ -1218,6 +1218,9 @@ class Vls.Server {
         } else if (sym is Vala.Namespace) {
             var ns_sym = sym as Vala.Namespace;
             return @"$ns_sym";
+        } else if (sym is Vala.Enum) {
+            var enum_sym = sym as Vala.Enum;
+            return (only_type_names ? "" : "enum ") + @"$(enum_sym.name)";
         } else {
             debug (@"get_symbol_data_type: unsupported symbol $(sym.type_name)");
         }
@@ -1936,6 +1939,12 @@ class Vls.Server {
                     language = "vala",
                     value = get_symbol_data_type (sym, result is Vala.Literal)
                 });
+                var comment = get_symbol_comment (sym);
+                if (comment != null) {
+                    hoverInfo.contents.add (new MarkedString () {
+                        value = comment.value
+                    });
+                }
             } else if (result is Vala.CastExpression) {
                 hoverInfo.contents.add (new MarkedString () {
                     language = "vala",