CLJS-3020: cljs.main: Incorrect documentation for the --compile flag

Fixed documentation for the --compile flag of cljs.main. Previously
it was mentioning a nonexistent --server option (instead of --serve).

Author: avfonarev

src/main/clojure/cljs/cli.clj

@@ -603,7 +603,7 @@ present"
                                 :doc (str "Run a compile. If optional namespace specified, use as "
                                           "the main entry point. If --repl follows, "
                                           "will launch a REPL after the compile completes. "
-                                          "If --server follows, will start a web server that serves "
+                                          "If --serve follows, will start a web server that serves "
                                           "the current directory after the compile completes.")}
       ["-s" "--serve"]         {:fn serve-opt
                                 :arg "host:port"