Remove duplicated "Supported CPU architectures" from "Supported platforms" table

[jketema]

Table looks a bit odd at the moment:

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[adityasharad]

Much better thanks. Probably a leftover from a point where we supported different architectures for different versions of macOS.

[jketema]

Probably a leftover from a point where we supported different architectures for different versions of macOS.

That's my guess too.