Update version compatibility matrix

Author: Jamalam360

docs/supported-versions.md

@@ -8,18 +8,20 @@ With the exception of Utility Belt, critical issues _might_ still be fixed on
 unsupported versions - this applies to my more popular mods. Please report the
 issue on GitHub, but do not be surprised if it is closed.
 
-| Mod                                                                                | <1.19.2 | 1.19.2 | 1.19.4 | 1.20.1 | 1.20.2 | 1.20.4 | 1.20.6 | 1.21.1 | 1.21.2 |
-| ---------------------------------------------------------------------------------- | ------- | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ |
-| [JamLib](https://github.com/JamCoreModding/jamlib)                                 | ❌      | ❌     | ❌     | ❌     | 💤     | 💤     | 💤     | ✅     | 🚧     |
-| [RightClickHarvest](https://github.com/JamCoreModding/right-click-harvest)         | ❌      | ❌     | ❌     | ❌     | 💤     | 💤     | 💤     | ✅     | 🚧     |
-| [Utility Belt](https://github.com/JamCoreModding/utility-belt)                     | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     |
-| [Shut Up GL Error](https://github.com/JamCoreModding/shut-up-gl-error)\*           | ❌      | ❌     | ❌     | 💤     | 💤     | ❌     | ❌     | ❌     | ❌     |
-| [Reaping](https://github.com/JamCoreModding/reaping)                               | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     |
-| [Wake Up Time](https://github.com/JamCoreModding/wake-up-time)                     | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     |
-| [You May Rest Now](https://github.com/JamCoreModding/you-may-rest-now)             | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     |
-| [Quicker Connect Button](https://github.com/JamCoreModding/quicker-connect-button) | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     |
+| Mod                                                                                | <1.19.2 | 1.19.2 | 1.19.4 | 1.20.1 | 1.20.2 | 1.20.4 | 1.20.6 | 1.21/1.21.1 | 1.21.2/1.21.3 | 1.21.4 |
+| ---------------------------------------------------------------------------------- | ------- | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ |
+| [JamLib](https://github.com/JamCoreModding/jamlib)                                 | ❌      | ❌     | ❌     | ❌     | 💤     | 💤     | 💤     | ✅     | ✅     | ✅     |
+| [RightClickHarvest](https://github.com/JamCoreModding/right-click-harvest)         | ❌      | ❌     | ❌     | ❌     | 💤     | 💤     | 💤     | ✅     | ✅     | ✅     |
+| [Utility Belt](https://github.com/JamCoreModding/utility-belt)                     | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | ❌\*1  | ✅     |
+| [Shut Up GL Error](https://github.com/JamCoreModding/shut-up-gl-error)\*2          | ❌      | ❌     | ❌     | 💤     | 💤     | ❌     | ❌     | ❌     | ❌     | ❌     |
+| [Reaping](https://github.com/JamCoreModding/reaping)                               | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     | 🚧     |
+| [Wake Up Time](https://github.com/JamCoreModding/wake-up-time)                     | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     | 🚧     |
+| [You May Rest Now](https://github.com/JamCoreModding/you-may-rest-now)             | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     | 🚧     |
+| [Quicker Connect Button](https://github.com/JamCoreModding/quicker-connect-button) | ❌      | ❌     | ❌     | ❌     | ❌     | 💤     | 💤     | ✅     | 🚧     | 🚧     |
 
-\* I can no longer reproduce this error on newer versions, so the mod is
+- **\*1**: Accessories does not support this version, so Utility Belt is unavailable for it.
+
+- **\*2**: I can no longer reproduce this error on newer versions, so the mod is
 discontinued. If you can reproduce the error reliably, please let me know.
 
 _Any mods not listed in this table are likely discontinued. If unsure, feel free