suggestion for OS X

[RaOneK]

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)
• My pull request targets the master branch of freeCodeCamp.
• None of my changes are plagiarized from another source without proper attribution.
• My article does not contain shortened URLs or affiliate links.

If your pull request closes a GitHub issue, replace the XXXXX below with the issue number.

Closes #XXXXX

[lynxlynxlynx]

Seems pointless to mention it like that. For any instruction, people can do whatever they want.

[QuincyLarson]

@OctaR Awesome! Thanks! Congrats on your first open source contribution to this repository!