Fix typo in `src/fmt_fp.c` [ci skip]
@@ -79,7 +79,7 @@ static const mrb_float g_neg_pow[] = {
* prec: is the precision (as specified in printf)
* sign: should be '\0', '+', or ' ' ('\0' is the normal one - only print
* a sign if ```f``` is negative. Anything else is printed as the
- * sign character for positive nubers.
+ * sign character for positive numbers.
*/
int
