Document read_only option for mounts (#2071)

docs/api/supervisor/endpoints.md

@@ -1901,7 +1901,8 @@ Returns information about mounts configured in Supervisor
       "type": "cifs",
       "server": "server.local",
       "share": "media",
-      "state": "active"
+      "state": "active",
+      "read_only": false
     }
   ]
 }
@@ -1942,7 +1943,8 @@ Value in `name` must be unique and can only consist of letters, numbers and unde
   "server": "server.local",
   "share": "media",
   "username": "admin",
-  "password": "password"
+  "password": "password",
+  "read_only": false
 }
 ```
 
@@ -1965,7 +1967,8 @@ name, it cannot be changed. Delete and re-add the mount to change the name.
   "usage": "media",
   "type": "nfs",
   "server": "server.local",
-  "path": "/media/camera"
+  "path": "/media/camera",
+  "read_only": true
 }
 ```
 

docs/api/supervisor/models.md

@@ -278,6 +278,7 @@ The `content` key of a backup object contains the following keys:
 | usage      | string         | Usage of the mount (backup, media, or share)                           | both             |
 | server     | string         | IP address or hostname of the network share server                     | both             |
 | port       | int            | Port to use (if not using the standard one for the mount type)         | both             |
+| read_only  | bool           | Mount is read-only (not available for backup mounts)                   | both             |
 | path       | string         | (nfs mounts only) Path to mount from the network share                 | both             |
 | share      | string         | (cifs mounts only) Share to mount from the network share               | both             |
 | username   | string         | (cifs mounts only) Username to use for authentication                  | request only     |