Fix a typo [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67389 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

array.c

@@ -1114,7 +1114,7 @@ ary_take_first_or_last(int argc, const VALUE *argv, VALUE ary, enum ary_take_pos
     long offset = 0;
 
     argc = rb_check_arity(argc, 0, 1);
-    /* the case optional argument is ommited should be handled in
+    /* the case optional argument is omitted should be handled in
      * callers of this function.  if another arity case is added,
      * this arity check needs to rewrite. */
     RUBY_ASSERT_WHEN(TRUE, argc == 1);