docs: fix the preview delete invocation

[Zach Dunn (zachdunn)]

Follow-up to #683. The playbook's cleanup command, wrangler preview delete <name>, just prints help — the name is a flag, not a positional. Verified on wrangler 4.110 while deleting the demo preview:

npx wrangler preview delete --name previews-adoption-test -y
✨ Preview "previews-adoption-test" deleted successfully.

One line changed in docs/previews.md.

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