As a professional accountant, speaker,teacher and founding partner in a now international firm, I am quite used to reviewing and editing documents of all types. I edited my ex wife's masters papers and thesis. I'm a sticker for correct word and grammar usage, as well as spelling. You can trust that your story will not be criticised for having such errors. I also will edit for continuity and readability. Nothing worse than having a character called "Bill" in a story only to see it appear as "Bob" in a couple of paragraphs in the middle of the story.