Add comment; fix lint

app.go

@@ -256,6 +256,9 @@ func (l loggerOption) String() string {
 	return fmt.Sprintf("fx.Logger(%v)", l.p)
 }
 
+// DisableSignalHandler disables fx's default signal handling. Instead relying
+// on the Go's default signal handling, or the user's signal handling if they've
+// registered with signal.Notify.
 func DisableSignalHandler() Option {
 	return disableSignalHandler{}
 }