Docs: gov spec needs more details in v0.46

[nooomski]

Summary

The gov docs for v0.46 are missing a few key details that can inform clients.

Problem Definition

Currently not covered:

• Which proposals require submit-legacy-proposal
• The fact that the gov module address is required as from_address in MsgSend and other TXs
• Metadata length param
• Details about metadata
  • Default length
  • That it's a string
  • That the intention is to have a URL on-chain and the metadata JSON sit offchain
  • A metadata schema

Proposal

High level information should sit under 01_concepts.md.
Everything except metadata details isn't blocked currently.
Hypha is currently working on drafting a metadata schema. Once we have this in place, we can add that information and complete the work.

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For Admin Use

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• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[nooomski]

Few elements in this issue are not yet resolved. Could we keep this open until the metadata story has been resolved? Some of this is being discussed in #11301

[julienrbrt]

This has been implemented in #13118