[3.12] Create hyperlink and fix typos in macOS installer

[hugovk]

Some little things following #123800:

• "can be build" -> "can be built"
• "Rosetta2" -> "Rosetta 2" (ref: https://support.apple.com/en-gb/guide/security/secebb113be1/web)
• Create hyperlink for https://www.python.org/downloads/source/