docs(clap): fix failing doc tests

src/app.rs

@@ -446,7 +446,7 @@ impl<'a, 'v, 'ab, 'u, 'ar> App<'a, 'v, 'ab, 'u, 'ar>{
     /// # let app = App::new("myprog")
     /// .subcommand(SubCommand::new("config")
     ///                .about("Controls configuration features")
-    ///                .arg_from_usage("<config> 'Required configuration file to use'")))
+    ///                .arg_from_usage("<config> 'Required configuration file to use'"))
     ///             // Additional subcommand configuration goes here, such as other arguments...
     /// # .get_matches();
     /// ```

src/args/arg.rs

@@ -196,7 +196,6 @@ impl<'n, 'l, 'h, 'b, 'p, 'r> Arg<'n, 'l, 'h, 'b, 'p, 'r> {
     /// // A required positional argument named "input"
     /// Arg::from_usage("<input> 'the input file to use'")
     /// ])
-    /// # 
     /// # .get_matches();
     pub fn from_usage(u: &'n str) -> Arg<'n, 'n, 'n, 'b, 'p, 'r> {
         assert!(u.len() > 0, "Arg::from_usage() requires a non-zero-length usage string but none was provided");