docs(template-require-mandatory-role-attributes): fix spinbutton required-ARIA description (Copilot review)

Per WAI-ARIA, role=spinbutton requires aria-valuenow. The docs table
previously said 'no required ARIA'. Update to reflect that <input
type='number'> supplies the required value state via native value/min/max,
which accessibility mappings expose as aria-valuenow — the role IS required,
the native element provides it.

Author: johanrd

docs/rules/template-require-mandatory-role-attributes.md

@@ -52,7 +52,7 @@ Exempt pairings include (non-exhaustive):
 | `<input type="checkbox">` | `checkbox`, `switch` | native `checked` state                           |
 | `<input type="radio">`    | `radio`              | native `checked` state                           |
 | `<input type="range">`    | `slider`             | native `value` / `min` / `max`                   |
-| `<input type="number">`   | `spinbutton`         | native `value` (spinbutton has no required ARIA) |
+| `<input type="number">`   | `spinbutton`         | native `value` / `min` / `max` (spinbutton's required `aria-valuenow` is derived from the native `value`) |
 | `<input type="text">`     | `textbox`            | no required ARIA                                 |
 | `<input type="search">`   | `searchbox`          | no required ARIA                                 |