Fix typos in docstring of require macro

Author: athos

src/main/clojure/cljs/core.cljc

@@ -2780,7 +2780,7 @@
   Recognized options:
   :as takes a symbol as its argument and makes that symbol an alias to the
     lib's namespace in the current namespace.
-  :refer takes a list of symbols to refer from the namespace..
+  :refer takes a list of symbols to refer from the namespace.
   :refer-macros takes a list of macro symbols to refer from the namespace.
   :include-macros true causes macros from the namespace to be required.
   :rename specifies a map from referred var names to different
@@ -2801,7 +2801,7 @@
 
   The following would load the library clojure.string :as string.
 
-  (require '[clojure/string :as string])"
+  (require '[clojure.string :as string])"
   [& args]
   `(~'ns* ~(cons :require args)))