Update intro blurb in `wasm32-wasip1` docs

I was reading over this documentation in light of the effort to enlist
more maintainers for Tier 2 targets and figured it was time for a
refresh of this documentation now that historical renames/etc have all
become a thing of the past. No new major changes to this documentation,
mostly just wanted to update it and reflect the modern status quo for
this target.

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