docs: Update GovDAO proposer

[Kouteki]

Clarify that only GovDAO member can propose a validator set change

[Gno2D2]

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[leohhhn]

Need to run gno test . -v -update-golden-tests in the valopers file for the CI

[moul]

Suggested change

	Read more: [How to become a testnet validator](https://gnops.io/articles/guides/become-testnet-validator/)
	Read more: [How to become a testnet validator](https://gnops.io/articles/guides/become-testnet-validator/) <!-- XXX: replace with a r/gnops/blog:xxx link -->