misc: fix grammar and spelling

[jbampton]

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[cjbj]

Excellent - thanks for the contribution. I'll merge it to our internal repo, and then @anthony-tuininga will push back here to GitHub when he does his next round of updates.

[cjbj]

I've created our internal PR and it will wend its way back to GitHub in the near future. The attention to detail is appreciated.

• I left nanoarrow.c since we take that from upstream.
• There was one small grammar fix of "a universal2" to "an universal2" that I didn't agree with and didn't make.