docs/CARS: Add 2021 C-HR (#23078)

`@eFini#8426` confirmed...
https://discord.com/channels/469524606043160576/524327905937850394/914925655228031017 [my inquiry]
https://discord.com/channels/469524606043160576/524327905937850394/915131655679791144 [his confirmation]

Still stuck w/ stock longitudinal, despite being TSS2.5.

He's been using it for many months, as seen in one of his early posts that came to Adeeb's attention for route analysis...
https://discord.com/channels/469524606043160576/524327905937850394/827038344742699008 [`88551059c417a545|2021-03-29--23-34-50`]

docs/CARS.md

@@ -50,7 +50,7 @@
 | Toyota    | Camry 2021-22                 | All               | openpilot        | 0mph<sup>4</sup>   | 0mph              |
 | Toyota    | Camry Hybrid 2018-20          | All               | Stock            | 0mph<sup>4</sup>   | 0mph              |
 | Toyota    | Camry Hybrid 2021-22          | All               | openpilot        | 0mph               | 0mph              |
-| Toyota    | C-HR 2017-20                  | All               | Stock            | 0mph               | 0mph              |
+| Toyota    | C-HR 2017-21                  | All               | Stock            | 0mph               | 0mph              |
 | Toyota    | C-HR Hybrid 2017-19           | All               | Stock            | 0mph               | 0mph              |
 | Toyota    | Corolla 2017-19               | All               | Stock<sup>3</sup>| 20mph<sup>1</sup>  | 0mph              |
 | Toyota    | Corolla 2020-22               | All               | openpilot        | 0mph               | 0mph              |