docs: remove duplicated supported values from schema desc

As we now automatically add the supported values from the schema to the
docs, we no longer need to state them in the description of the node
(which is an antipattern anyways).

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

kas/schema-kas.json

@@ -193,7 +193,7 @@
                                 ]
                             },
                             "type": {
-                                "description": "Type of version control repository. The supported values are ``git`` and ``hg``.",
+                                "description": "Type of version control repository.",
                                 "default": "git",
                                 "type": "string",
                                 "enum": ["git", "hg"]