Add warnings about limited availability of versioning features

Signed-off-by: Louis Chemineau <louis@chmn.me>

Author: artonge

user_manual/files/version_control.rst

@@ -36,6 +36,8 @@ versions until it meets the disk space limit again.
 Naming a version
 ----------------
 
+.. warning:: Naming a version is currently not enabled when group folders or S3 versioning is enabled.
+
 You can give a name to a version.
 
 .. figure:: ../images/files_versions_actions.png
@@ -46,4 +48,6 @@ When a version has a name, it will be excluded from the automatic expiration pro
 Deleting a version
 ------------------
 
+.. warning:: Deleting a version is currently not enabled when group folders or S3 versioning is enabled.
+
 You can also manually delete a version without waiting for the automatic expiration process.