landlock: Improve the comment for domain_is_scoped

Currently it is not obvious what "scoped" mean, and the fact that the
function returns true when access should be denied is slightly surprising
and in need of documentation.

Cc: Tahera Fahimi <[e-mail]>
Signed-off-by: Tingmao Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
[mic: Fix formatting and improve consistency]
Signed-off-by: Mickaël Salaün <[e-mail]>

security/landlock/task.c

···
 }
 
 /**
- * domain_is_scoped - Checks if the client domain is scoped in the same
- *		      domain as the server.
+ * domain_is_scoped - Check if an interaction from a client/sender to a
+ *		      server/receiver should be restricted based on scope controls.
  *
  * @client: IPC sender domain.
  * @server: IPC receiver domain.
  * @scope: The scope restriction criteria.
  *
- * Returns: True if the @client domain is scoped to access the @server,
- * unless the @server is also scoped in the same domain as @client.
+ * Returns: True if @server is in a different domain from @client, and @client
+ * is scoped to access @server (i.e. access should be denied).
  */
 static bool domain_is_scoped(const struct landlock_ruleset *const client,
 			     const struct landlock_ruleset *const server,