[Updated] D11811: docs: update Rust readme with a mention of `rhg`

[pulkit (Pulkit Goyal)]

This revision is now accepted and ready to land.
pulkit accepted this revision.

REPOSITORY
  rHG Mercurial

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D11811/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D11811

To: Alphare, #hg-reviewers, pulkit
Cc: mercurial-patches
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