GUACAMOLE-1629: Fix client/cache confusion in comments.

extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/conf/VaultAttributeService.java

@@ -37,7 +37,6 @@ public interface VaultAttributeService {
      * @return
      *     All custom connection group attributes to be exposed through the
      *     admin UI for the current vault implementation.
-     *
      */
     public Collection<Form> getConnectionGroupAttributes();
 }