Add overline to vt comments

Part of #4529

Author: Tyriar

src/common/InputHandler.ts

@@ -2425,6 +2425,8 @@ export class InputHandler extends Disposable implements IInputHandler {
    * | 47        | Background color: White.                                 | #Y      |
    * | 48        | Background color: Extended color.                        | #P[Support for RGB and indexed colors, see below.] |
    * | 49        | Background color: Default (original).                    | #Y      |
+   * | 53        | Overlined.                                               | #Y      |
+   * | 55        | Not Overlined.                                           | #Y      |
    * | 58        | Underline color: Extended color.                         | #P[Support for RGB and indexed colors, see below.] |
    * | 90 - 97   | Bright foreground color (analogous to 30 - 37).          | #Y      |
    * | 100 - 107 | Bright background color (analogous to 40 - 47).          | #Y      |