docs: Update SUMMARY.md (feast-dev#4340)

Update SUMMARY.md

Author: franciscojavierarceo

docs/SUMMARY.md

@@ -121,7 +121,8 @@
   * [\[Alpha\] Go feature server](reference/feature-servers/go-feature-server.md)
   * [Offline Feature Server](reference/feature-servers/offline-feature-server)
 * [\[Beta\] Web UI](reference/alpha-web-ui.md)
-* [\[Alpha\] On demand feature view](reference/alpha-on-demand-feature-view.md)
+* [\[Beta\] On demand feature view](reference/beta-on-demand-feature-view.md)
+* [\[Alpha\] Vector Database](reference/alpha-vector-database.md)
 * [\[Alpha\] Data quality monitoring](reference/dqm.md)
 * [Feast CLI reference](reference/feast-cli-commands.md)
 * [Python API reference](http://rtd.feast.dev)