change(dev doc): Document how to change branch protection rules

[teor2345]

Motivation

This PR documents branch protection rules.

Solution

Document when we add branch protection rules, and what they do.

Review

This is a low priority developer documentation update.

Reviewer Checklist

• Are the PR labels correct?
• Does the code do what the ticket and PR says?
  • Does it change concurrent code, unsafe code, or consensus rules?
• How do you know it works? Does it have tests?

[gustavovalverde]

@Mergifyio refresh

[mergify]

refresh

✅ Pull request refreshed

[gustavovalverde]

@Mergifyio queue batched

[mergify]

queue batched

❌ Branch protection setting 'linear history' conflicts with Mergify configuration

Branch protection setting 'linear history' works only if merge_method: squash or merge_method: rebase.

[gustavovalverde]

@Mergifyio requeue batched

[mergify]

requeue batched

❌ This pull request head commit has not been previously disembarked from queue.

[mpguerra]

I thought this would include actual details (and possibly screenshots) of where and how these can be changed in github. e.g from the repo go to Settings > Branches and click "Edit" on the main branch entry.

I was able to figure this out myself but I was a bit nervous clicking around unsure of what would happen...