Update release docs to include Homebrew information #8386

Describe the feature or problem you’d like to solve

A clear and concise description of what the feature or problem is.

Update docs/releasing.md with basic information on how GitHub CLI and Homebrew release processes work in tandem.

The GitHub CLI Deployment workflow uses mislav/bump-homebrew-formula-action action to open a pull request to open pull request to update formula metadata, which is eventually picked up in a scheduled workflow in homebrew/formulae.brew.sh

Described on Homebrew formula cookbook docs:

Homebrew uses Git for storing formulae and contributing to the project.

As of Homebrew 4.0.0, formulae are downloaded as JSON from https://formulae.brew.sh which is automatically regenerated
by a scheduled Homebrew/formulae.brew.sh job from the master branch of the Homebrew/homebrew-core repository.

Proposed solution

How will it benefit CLI and its users?

This will benefit the GitHub CLI in the case of troubleshooting and supporting the deployment pipeline, providing faster resolution to an rarely touched process.

Additional context

Add any other context like screenshots or mockups are helpful, if applicable.