Merge pull request #3015 from murasesyuka/fix/fix_lshift_and_fix_rshift_doc

fix comment

src/numeric.c

@@ -856,7 +856,7 @@ fix_shift_get_width(mrb_state *mrb, mrb_int *width)
 /* 15.2.8.3.12 */
 /*
  * call-seq:
- *   fix << count  ->  integer
+ *   fix << count  ->  integer or float
  *
  * Shifts _fix_ left _count_ positions (right if _count_ is negative).
  */
@@ -881,7 +881,7 @@ fix_lshift(mrb_state *mrb, mrb_value x)
 /* 15.2.8.3.13 */
 /*
  * call-seq:
- *   fix >> count  ->  integer
+ *   fix >> count  ->  integer or float
  *
  * Shifts _fix_ right _count_ positions (left if _count_ is negative).
  */