Fix some errors in guestbook-go
Fix some errors in guestbook-go

Fix some errors in guestbook-go README.md:

1. fix some markdown errors by removing the `<nop>` tag
2. replace some (not all of them) `containers` with `pods`
3. `gcloud comput` -> `gcloud compute`
4. improved sentences that has `list all` to make the descriptions more accurate
5. other tiny fixes

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