A family of Microsoft word processing software products for creating web, email, and print documents.
I'm not sure which specific instructions you're referring to but they are "totally unhelpful" because they pertain to the Windows product. If you check the Applies to at the top of the page it probably doesn't include Mac. If the information is incorrect please provide a link to the page I'll send in a request to have it corrected.
As HansV indicated you can use the Keep Text Only option available from the Paste tool on the Home tab or you can use the Paste Options button which appears immediately after you paste.
The command can be added to the QAT & also can be assigned a keyboard shortcut.