[docs] [issue25523] Correct "a" article to "an" article

[Martin Panter]

Martin Panter added the comment:

Thanks Serhiy. My pass over the files missed most cases where there was a line break involved, and certain punctuation and markup, which you picked up on.

I skipped the /Lib/msilib/schema.py file in my patch because it was part of the data rather than a comment, and I wasn’t sure what it is for. It seems to be a generated file from some Windows source. But I see other people have made similar corrections, so it might be okay.

I left a couple of comments. Apart from those, the rest look good to me.

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