## Issue Addressed
NA
## Proposed Changes
When we released [`v1.4.0-rc.0`](https://github.com/sigp/lighthouse/releases/tag/v1.4.0-rc.0), we added a bunch of text about pre-releases. That information was useful, but somewhat hard to reference in future pre-releases.
This PR adds some docs to the book so whenever we do a pre-release we can point users to these docs for more info.
## Additional Info
NA
