Fix some typos in machine verifier comments and trace output

[danstadelmann]

Stumbled across a typo in the MachineVerifier file and since I had it open, I changed some other comments.

Not important but why not leave it a bit cleaner 🙂

It's basically part of the CodeGen Directory and therefore maybe something for @rnk but since it does not change any functionality I guess any maintainer could approve it.

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[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[MacDue]

Looks like some tests need to be updated to match the corrected G_BUILD_VECTOR error message (and comments need reformatting).

[github-actions]

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