Update adding-a-new-package.md (#2249)

## Checklist

- [-] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [-] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [-] I have not broken the cheatsheet

docs/contributing/adding-a-new-package.md

@@ -15,4 +15,4 @@ For any packages that you need to depend on, you can run
 pnpm add some-package
 ```
 
-from the `packages/foo` directory. Note that `some-package` could be a local package, eg `@cursorless/common`. In that case, you need to re-run `pnpm -w meta-updater` after adding the dependency, so that the Typescript references can be updated.
+from the `packages/foo` directory. Note that `some-package` could be a local package, eg `@cursorless/common`. In that case, you need to re-run `pnpm -w fix:meta` after adding the dependency, so that the Typescript references can be updated.