refactor(docs): remove outdated references to Scylla Open Source and Scylla Enterprise (#4780)

* docs: Remove references to Scylla Open Source and Scylla Enterprise

Co-authored-by: Michal-Leszczynski <74614433+Michal-Leszczynski@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Michal-Leszczynski <74614433+Michal-Leszczynski@users.noreply.github.com>

Author: Copilot

docs/source/install-scylla-manager.rst

@@ -82,7 +82,6 @@ Local node
 ----------
 
 On the same node as you are installing ScyllaDB Manager, download and install ScyllaDB Server package.
-You can either use `ScyllaDB Enterprise <https://www.scylladb.com/download/#enterprise>`_ or `ScyllaDB Open Source <https://www.scylladb.com/download/#open-source>`_.
 There is no need to run the ScyllaDB setup, it is taken care of later, by the ``scyllamgr_setup`` script.
 When it's installed you can jump to `Run the scyllamgr_setup script`_ section.
 

docs/source/restore/index.rst

@@ -23,8 +23,6 @@ Restore and backups are scheduled in the same manner: you can start, stop, resum
 .. warning::
     Restore works only when ScyllaDB version of backed-up cluster is the same or older than ScyllaDB version of restore destination cluster.
 
-    Mixing ScyllaDB Enterprise and ScyllaDB Open Source versions could lead to unexpected results.
-
 Restore types
 =============