Merge pull request #6352 from EnterpriseDB/docs/pgd/restoresemvernote

Update upgrade_paths.mdx with semantic versioning note

Author: djw-m

product_docs/docs/pgd/5.6/upgrades/upgrade_paths.mdx

@@ -4,6 +4,9 @@ title: Supported PGD upgrade paths
 
 ## Upgrading within version 5
 
+EDB Postgres Distributed uses [semantic versioning](https://semver.org/). 
+All changes within the same major version are backward compatible, lowering the risk when upgrading and allowing you to choose any later minor or patch release as the upgrade target. 
+
 You can upgrade from any version 5.x release to a later 5.x release. 
 
 ## Upgrading from version 4 to version 5