docs: migration guide tweaks (#1123)

## 🧰 Changes

fixing up a few oversights that fell through the cracks! will backport
these changes to v9 once this is merged.

documentation/migration-guide.md

@@ -117,7 +117,6 @@ If you're using the `rdme` GitHub Action, update your GitHub Actions workflow fi
    The following commands (and their subcommands) will be removed in `rdme@10`:
 
    - `categories`
-   - `changelogs`
    - `custompages`
    - `docs` (and its `guides` alias)
    - `versions`
@@ -136,14 +135,16 @@ Please see [the `[email protected]` release notes](https://github.com/readmeio/rdme/rel
 
 ## Version Compatibility Matrix
 
-| Feature                                                                                                                                     | v8     | v9          | v10         |
+| Feature                                                                                                                                     | `v8`   | `v9`        | `v10`       |
 | ------------------------------------------------------------------------------------------------------------------------------------------- | ------ | ----------- | ----------- |
 | Actively Maintained?                                                                                                                        | ❌     | ✅          | ✅          |
-| Support for [ReadMe Refactored](https://docs.readme.com/main/docs/welcome-to-readme-refactored)                                             | ❌     | ❌          | ✅          |
+| Support for [ReadMe Refactored](https://docs.readme.com/main/docs/welcome-to-readme-refactored)\*                                           | ❌     | ❌          | ✅          |
 | Supports Bi-Directional Sync                                                                                                                | ❌     | ❌          | ✅          |
 | Support for Legacy Projects (i.e., not yet migrated to [ReadMe Refactored](https://docs.readme.com/main/docs/welcome-to-readme-refactored)) | ✅     | ✅          | ❌          |
 | Node.js Requirements                                                                                                                        | `>=14` | `>=20.10.0` | `>=20.10.0` |
 
+\*If you uploaded an API definition prior to migrating your project to ReadMe Refactored, any existing workflows for syncing these files that use a legacy `rdme` version (i.e., `v9` or earlier) should continue to work, even after migrating. **For new workflows, we recommend following this migration guide and upgrading to the latest version.**
+
 ## Need Help?
 
 If you notice any issues or disruptions to your workflow during migration, we're here to help! Feel free to...