fix: jq.md toolchains reference

[kolloch]

A simple documentation-only fix.

[CLAassistant]

All committers have signed the CLA.

[thesayyn]

I don't think this would work, genrule's expect a target that materializes the toolchain type and returns some providers, OTOH toolchain types are not materialized if you just depend on toolchain type.

[alexeagle]

Also, if there's a doc-only change, it should reflect an identical edit to an example/ or e2e/ test code change, so we know it's load-bearing and functional.

I'm closing PRs just to clean up the GH repo but please feel free to re-open if we got it wrong.