array.c: update Array#dig doc

* array.c (rb_ary_dig): [DOC] update an example of error message
  by Array#dig, because of Integer Unification.  [Fix GH-1455]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56337 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Oct  4 12:59:44 2016  Koichi ITO  <koic.ito@gmail.com>
+
+	* array.c (rb_ary_dig): [DOC] update an example of error message
+	  by Array#dig, because of Integer Unification.  [Fix GH-1455]
+
 Tue Oct  4 09:55:12 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/bigdecimal/bigdecimal.c (BigDecimal_div2): need more room

array.c

@@ -5665,7 +5665,7 @@ rb_ary_any_p(VALUE ary)
  *
  *   a.dig(0, 1, 1)                    #=> 3
  *   a.dig(1, 2, 3)                    #=> nil
- *   a.dig(0, 0, 0)                    #=> TypeError: Fixnum does not have #dig method
+ *   a.dig(0, 0, 0)                    #=> TypeError: Integer does not have #dig method
  *   [42, {foo: :bar}].dig(1, :foo)    #=> :bar
  */