Indent the new <sect2> (from <sect3>) one step back.

[wblock]

Looks good. When doing a large whitespace fix, I usually try to check and fix the whole file with igor -RZ to keep the number of whitespace-only commits low. That's not required, just something to consider. It's easier, now that the Porter's Handbook is split into separate chapters.

Remember to build-test, and mention in the commit message that it is a whitespace-only change, so translators can ignore it. Thanks!