tls: correct which db_* commands ask for the domain type

db_list addresses no domain at all, so it never asks for a type.

Author: dariusstefan

docs/modules/tls.md

@@ -20,10 +20,10 @@ as paths to files.  A TLS domain is identified by its name and its type
 ```
 opensips-cli -x tls db_delete a.example.org server
 ```
-All of them ask for the type when it is not given.  `db_add` and `db_show`
-default to `server`, while `db_update` and `db_delete` have no default and keep
-asking until one is given, so that they cannot change a different domain than
-the intended one.
+The commands addressing a single domain ask for the type when it is not given.
+`db_add` and `db_show` default to `server`, while `db_update` and `db_delete`
+have no default and keep asking until one is given, so that they cannot change
+a different domain than the intended one.
 
 `db_add` and `db_update` take the remaining `tls_mgm` columns as `column=value`
 arguments, in any order and after the domain and the type: