Common-Issues: Documents resolving dual installations from Migration Assistant copies

[colindean]

This is an extract and refactor of the linked Discussions post from @gromgit.

https://github.com/orgs/Homebrew/discussions/4397#discussioncomment-5567441 has been useful to at least a few people in my org this week as it’s clearly “new laptop season” and we’re hitting the ~last of the Intel Macs still in service, those put in service 2020 when my company switched wholesale to M1 macs in the 2021 refresh cycle. I expect more people to be hitting this problem en masse in the next few weeks/months as they switch architectures.

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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[p-linnane]

Good idea.

[EricFromCanada]

This'll add each line as a new section in the same list item and should allow the mdl check to pass.

[MikeMcQuaid]

Thanks @colindean!