Revise arm platform notes regarding soft float This PR updates the Arm microcontroller platform docs to recommend `-fpregs` instead of `+soft-float` as [discussed on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/.60-Ctarget-feature.3D.2Bsoft-float.60.20considered.20harmful) |
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