docs: Update mint docs (backport #22108)

[mergify]

Description

ref: #21429

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Summary by CodeRabbit

• Documentation
  • Enhanced clarity and detail regarding the minting mechanism and its parameters.
  • Introduced a new MintFn function for user-defined minting logic, replacing the deprecated InflationCalculationFn.
  • Updated Params section to include a new MaxSupply parameter for controlling token minting limits.
  • Expanded client interaction sections with new commands for querying the mint module via CLI, gRPC, and REST.

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This is an automatic backport of pull request #22108 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 8e34382 has failed:

On branch mergify/bp/release/v0.52.x/pr-22108
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 8e3438246.
  (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 <file>..." to mark resolution)
	both modified:   x/mint/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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