REVIEWING.md: Fix status 4 merge label
@@ -21,7 +21,7 @@ exist on the repository should apply to issues.
* `status/1-design-review`
* `status/2-code-review`
* `status/3-docs-review`
- * `status/4-ready-to-merge`
+ * `status/4-merge`
Special status labels:
