CLJS-3148: Quote in goog-define docstring example

Author: LeaveNhA

src/main/clojure/cljs/core.cljc

@@ -743,7 +743,7 @@
     ;; can be overridden with
     :closure-defines {\"your_app.core.DEBUG_BANG_\" true}
     or
-    :closure-defines {'your-app.core/DEBUG! true}"
+    :closure-defines {your-app.core/DEBUG! true}"
   [sym default]
   (assert-args goog-define
    (core/or (core/string? default)