docs: update gov docs (backport #22048)

[mergify]

Description

ref: #21429

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Summary by CodeRabbit

• New Features

  • Introduced two new proposal types: multiple choice proposals and optimistic proposals.
  • Added a SPAM voting option to enhance proposal management.

• Documentation

  • Enhanced clarity and detail in the Governance module documentation, including updates on voting mechanisms, deposit handling, and proposal types.
  • Updated API endpoints for querying proposals, votes, and deposits to reflect new structures.

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This is an automatic backport of pull request #22048 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of deec679 has failed:

On branch mergify/bp/release/v0.50.x/pr-22048
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit deec679f2.
  (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:   docs/architecture/adr-069-gov-improvements.md
	both modified:   x/gov/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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