Whitespace cleanup and phrasing rationalization

[TallTed]

Sorry this touches a LOT of the doc. I started with trying to fix if/then phrasing, and got distracted by the whitespace. The changed files should look much smaller if you hide whitespace changes.

• Got rid of a bunch of extra leading and trailing spaces
• Made a bunch of if statements use consistent phrasing
• Fixed some typos

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[Wind4Greg]

Thanks @TallTed this is a good editorial clean up.

[msporny]

Editorial, multiple reviews, changes requested and made, no objections, merging.