container: improve documentation

This change removes inconsistencies collected over time in this package.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/initdaemon.go

@@ -24,8 +24,7 @@ const (
 	daemonTimeout = 5 * time.Second
 )
 
-// Daemon appends an [Op] that starts a daemon in the container and blocks until
-// [DaemonOp.Target] appears.
+// Daemon is a helper for appending [DaemonOp] to [Ops].
 func (f *Ops) Daemon(target, path *check.Absolute, args ...string) *Ops {
 	*f = append(*f, &DaemonOp{target, path, args})
 	return f