Modify macOS ansible installation to use pip
Modify macOS ansible installation to use pip

Previously, the documentation called for macOS users to install ansible
via brew, while the ubuntu documentation used pip. This will unify the
instructions so that both use pip.

Signed-off-by: Cullen Taylor <0a4f58109a9f9b7b2781cb48fa62bfe7918cb3d0@outlook.com>

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