watch_queue: Drop references to /dev/watch_queue

The merged API doesn't use a watch_queue device, but instead relies on
pipes, so let the documentation reflect that.

Fixes: f7e47677e39a ("watch_queue: Add a key/keyring notification facility")
Signed-off-by: Gabriel Krisman Bertazi <[email protected]>
Signed-off-by: David Howells <[email protected]>
Acked-by: Jarkko Sakkinen <[email protected]>
Reviewed-by: Ben Boeckel <[email protected]>
4 files changed