Update content/vault/v1.21.x (rc)/content/docs/updates/important-changes.mdx

Co-authored-by: Sarah Chavis <62406755+schavis@users.noreply.github.com>

Author: kpcraig

content/vault/v1.21.x (rc)/content/docs/updates/important-changes.mdx

@@ -56,7 +56,7 @@ more information.
 
 | Change       | Affected version | Vault edition
 | ------------ | ---------------- | -------------
-| New behavior | 1.21.x             | Enterprise
+| New behavior | 1.21.0+             | Enterprise
 
 Vault interprets `rotation_schedule` strings relative to UTC to match the
 behavior of static role rotations in the database plugin. Old rotations use