fix 3663 feedback when opening docs in browser

Author: brettearle

src/cli/rustup_mode.rs

@@ -1599,8 +1599,7 @@ fn doc(cfg: &Cfg, m: &ArgMatches) -> Result<utils::ExitCode> {
     } else if let Some((name, _, path)) = DOCS_DATA.iter().find(|(name, _, _)| m.get_flag(name)) {
         writeln!(
             process().stdout().lock(),
-            "Opening docs -{} in your browser",
-            name
+            "Opening docs named `{name}` in your browser"
         )?;
         path
     } else {