Update display message for cargo metadata

src/bin/cargo/commands/metadata.rs

@@ -8,7 +8,7 @@ pub fn cli() -> App {
              the concrete used versions including overrides, \
              in machine-readable format",
         )
-        .arg(opt("quiet", "No output printed to stdout").short("q"))
+        .arg(opt("quiet", "Do not print cargo log messages").short("q"))
         .arg_features()
         .arg(multi_opt(
             "filter-platform",