CLI V2 `brew` installation option for Mac OS

[hervenivon]

Why not mentioning the brew method to install the AWS CLI in the documentation https://github.com/awsdocs/aws-cli-user-guide/blob/master/doc_source/install-cliv2-mac.md?

brew is a common Mac package manager which is very convenient to install and upgrade the AWS CLI:

• Installation: brew install awscli
• Upgrade: brew upgrade awscli

[elysahall]

Hi Hervé,
Currently the CLI team does not maintain third-party repositories for the CLI v2, and therefore we don't recommend them. If you'd like repositories such as homebrew to be supported, I'd suggest making a feature request on the AWS CLI GitHub.

For some more discussion and the CLI dev team responses on this topic regarding CLI v2, see this GitHub issue regarding pip.

[hauntingEcho]

@hervenivon you may be interested in the discussion of the homebrew formula here: aws/aws-cli#727