alpha-rename .ident to .name in Lifetime, including in rustdoc.

src/libsyntax/parse/parser.rs

@@ -1609,7 +1609,7 @@ impl Parser {
                 return ast::Lifetime {
                     id: ast::DUMMY_NODE_ID,
                     span: span,
-                    ident: i.name
+                    name: i.name
                 };
             }
             _ => {