Update 4.6.5 release notes

Author: Jonathan S. Katz

docs/content/releases/4.6.5.md

@@ -24,4 +24,5 @@ PostgreSQL Operator 4.6.5 release includes the following software versions upgra
 
 - Ensure the `pgo create pgbouncer` command can set CPU and memory limits via `--cpu-limit` and `--memory-limit` respectively.
 - Ensure `pgo delete backup` works with backups stored in S3 or GCS. Reported by Munjal Patel (@munjalpatel).
-- Update the `aws-s3-ca.crt` value to use the newer CAs provided by AWS. If a PostgreSQL cluster is using the old default CA, PGO will update the general one kept in the `pgo-backrest-repo-config` Secret and `pgo upgrade` will update it for a specific cluster.S
+- Update the `aws-s3-ca.crt` value to use the newer CAs provided by AWS. If a PostgreSQL cluster is using the old default CA, PGO will update the general one kept in the `pgo-backrest-repo-config` Secret and `pgo upgrade` will update it for a specific cluster.
+- Allow for the original primary instance to be scaled down after running `pgo upgrade`.