Documentation: devlink: fix the locking section

As all callbacks are converted now, fix the text reflecting that change.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20220823070213.1008956-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Jiri Pirko

Documentation/networking/devlink/index.rst

@@ -13,10 +13,8 @@ new APIs prefixed by ``devl_*``. The older APIs handle all the locking
 in devlink core, but don't allow registration of most sub-objects once
 the main devlink object is itself registered. The newer ``devl_*`` APIs assume
 the devlink instance lock is already held. Drivers can take the instance
-lock by calling ``devl_lock()``. It is also held in most of the callbacks.
-Eventually all callbacks will be invoked under the devlink instance lock,
-refer to the use of the ``DEVLINK_NL_FLAG_NO_LOCK`` flag in devlink core
-to find out which callbacks are not converted, yet.
+lock by calling ``devl_lock()``. It is also held all callbacks of devlink
+netlink commands.
 
 Drivers are encouraged to use the devlink instance lock for their own needs.