[DOC] FIx typo in description of Hash#hash (regardless or/of order)

hash.c

@@ -3772,7 +3772,7 @@ hash_i(VALUE key, VALUE val, VALUE arg)
  *  Returns the Integer hash-code for the hash.
  *
  *  Two \Hash objects have the same hash-code if their content is the same
- *  (regardless or order):
+ *  (regardless of order):
  *    h1 = {foo: 0, bar: 1, baz: 2}
  *    h2 = {baz: 2, bar: 1, foo: 0}
  *    h2.hash == h1.hash # => true