docs: fixed some broken grammer.

[The-Real-Thisas]

"If you do not want to install Homebrew, alternative, but not recommended, instructions can be found below."

Seemed like broken english. It is possible that there is some reason it's phrased this way that I'm unaware of. But it annoyed me so I'm putting in a pull request.

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[The-Real-Thisas]

Thanks @markemer