tweak changelog, add releases

Author: jdpleiness

docs/releases.mdx

@@ -12,6 +12,7 @@ Currently supported versions of Sourcegraph:
 
 | **Release**  | **General Availability Date** | **Supported** | **Release Notes**                                                  | **Install**                                          |
 |--------------|-------------------------------|---------------|--------------------------------------------------------------------|------------------------------------------------------|
+| 6.3 Patch 0  | April 2025                    | ✅             | [Notes](https://sourcegraph.com/docs/technical-changelog#v630)     | [Install](https://sourcegraph.com/docs/admin/deploy) |
 | 6.2 Patch 3  | April 2025                    | ✅             | [Notes](https://sourcegraph.com/docs/technical-changelog#v623841)  | [Install](https://sourcegraph.com/docs/admin/deploy) |
 | 6.2 Patch 2  | April 2025                    | ✅             | [Notes](https://sourcegraph.com/docs/technical-changelog#v622553)  | [Install](https://sourcegraph.com/docs/admin/deploy) |
 | 6.2 Patch 1  | April 2025                    | ✅             | [Notes](https://sourcegraph.com/docs/technical-changelog#v621106)  | [Install](https://sourcegraph.com/docs/admin/deploy) |