CLEANUP: server: fix update_status() function comment

srv_update_status() function comment says that the function "is designed
to be called asynchronously".

While this used to be true back then with 64cc49cf
("MAJOR: servers: propagate server status changes asynchronously.")

This is not true anymore since 3ff577e ("MAJOR: server: make server state changes
synchronous again")

Fixing the comment in order to better reflect current behavior.
1 file changed