Update using.rst to advertise full mhu support for GHCi (!14426) · Merge requests · Glasgow Haskell Compiler / GHC · GitLab

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Hannes Siebenhandl requested to merge wip/fendor/fix-mhu-docs-using.rst into master Jun 18, 2025

finally closes #20889 (closed) and in particular addresses #20889 (comment 624435)