[nit] Use gcloud storage rather than gsutil

[zoomie]

Use gcloud storage cp rather than gsutil cp on this page.

Generally, you should use gcloud storage commands instead of gsutil commands

source

[holtskinner]

That's interesting! I didn't know it was no longer the preferred method. There's definitely a lot of pages to update with gcloud storage but we can start using it on new pages.

[zoomie]

It looks like they are trying to standardise it, like you said it's probably only worth doing on new pages, or if you're already editing the old pages. I enjoyed your video series!