[easy][minor] correct comment about runx (#2505)

This comment was incorrect. It IsDevboxPackage returns true for runx
(which is okay for this function)

## Summary

## How was it tested?

Signed-off-by: savil <676452+savil@users.noreply.github.com>

Author: savil

internal/devbox/packages.go

@@ -54,7 +54,7 @@ func (d *Devbox) Outdated(ctx context.Context) (map[string]UpdateVersion, error)
 	outdatedPackages := map[string]UpdateVersion{}
 
 	for _, pkg := range d.AllPackages() {
-		// For non-devbox packages, like flakes or runx, we can skip for now
+		// For non-devbox packages, like flakes, we can skip for now
 		if !pkg.IsDevboxPackage {
 			continue
 		}