I'm open to suggestion as to how to better phrase this.  These two sentences are trying to say different things, but I agree it's not as clear as it should be  The fundamental points I wish to get across here are that

- the main installation page covers Homebrew installation (of prerequisites, but not the server itself)
- the special homebrew page covers Homebrew installation (of both prerequisites and the server)

We should probably provide some additional guidance as to why you might want one over the other.  What exactly are the specific benefits (if any) of building and installing the server via homebrew as opposed to downloading the release like the main page documents?  And any downsides?