Fix wording in reno

Co-authored-by: Alex-Welsh <[email protected]>
(cherry picked from commit f47a2ac)

Author: seunghun1ee

releasenotes/notes/merge-openbao-vault-playbooks-0c78364f4a86f6e0.yaml

@@ -3,5 +3,5 @@ features:
   - |
     Merged OpenBao playbooks and Hashicorp Vault playbooks.
     They starts with the prefix "secret-store".
-    By default, the playbooks are set to be OpenBao playbooks.
+    By default, the playbooks will deploy OpenBao.
     To use Hashicorp Vault, set ``stackhpc_ca_secret_store: vault``.