chore(txsim): removes deprecated -r flag from txsim docker README (backport #3325)

[mergify]

This PR updates the example txsim Docker command by removing the deprecated -r flag, which was previously used to specify the RPC endpoint.

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This is an automatic backport of pull request #3325 done by Mergify.

[mergify]

Cherry-pick of d60eef7 has failed:

On branch mergify/bp/v1.x/pr-3325
Your branch is up to date with 'origin/v1.x'.

You are currently cherry-picking commit d60eef7e.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docker/README.md

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[rootulp]

I don't see a Dockerfile for txsim on v1.x in docker/ so I think this doesn't need to be backported. Ref: https://github.com/celestiaorg/celestia-app/tree/v1.x/docker

cc: @staheri14

[staheri14]

Thanks @rootulp, right, there is no docker file for it, no need to backport.