polishing documentation

Author: ryanjbaxter

docs/modules/ROOT/pages/server/environment-repository/vault-backend.adoc

@@ -174,7 +174,7 @@ By default, the config server generates property source names based on the vault
 When composite vault backends have the same vault key, the config server client will overwrite preceding property sources.
 
 With `fullKeyPath` set to `true`, the property sources will contain the full backend path,
-e.g. `vault:secret/backendA/myApp` and `vault:secret/backendB/myApp`.
+e.g. `vault:secret/backendA/myApp` and `vault:secret/backendB/myApp`, preventing overwriting the preceding property source.
 
 [source,yaml]
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