time.c: add example [ci skip]

* time.c (time_asctime): [DOC] add ctime example, not only
  asctime.  [ruby-core:75126] [Bug #12310]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54703 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Apr 22 20:34:04 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* time.c (time_asctime): [DOC] add ctime example, not only
+	  asctime.  [ruby-core:75126] [Bug #12310]
+
 Fri Apr 22 18:44:32 2016  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* variable.c: use uint32_t instead of long to avoid confusion about

time.c

@@ -3547,6 +3547,7 @@ static VALUE strftime_cstr(const char *fmt, size_t len, VALUE time, rb_encoding
  *  Returns a canonical string representation of _time_.
  *
  *     Time.now.asctime   #=> "Wed Apr  9 08:56:03 2003"
+ *     Time.now.ctime     #=> "Wed Apr  9 08:56:03 2003"
  */
 
 static VALUE