Docs update for Scanning Hash Fields

[sudhirj]

https://redis.uptrace.dev/guide/scanning-hash-fields.html needs to be updated, it's now possible to send an annotated struct to HSet - the example of pipelining to load data is no longer necessary.

Where are the docs these days? The link is rotten and still points to GitHub.com/go-redis. Will raise PRs to both fix this and the "Edit in GitHub" link.