docs: update 3.16.1 (#1059)

* docs: update 3.16.1

* Update docs/changelog/bytebase-3-16-1.mdx

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: adela-bytebase

docs/changelog/bytebase-3-16-1.mdx

@@ -28,6 +28,6 @@ import InstallUpgrade from '/snippets/install/install-upgrade.mdx';
 
 - Harden 3.16 upgrade migration scripts to be idempotent and handle edge cases.
 
-- **PolarDB** — Fix schema dump incorrectly including pg_bitmapindex system schema.
+- **PostgreSQL** — Fix schema dump incorrectly including `pg_bitmapindex` system schema.
 
 <InstallUpgrade />