Preamble text is free-form text that's often user-provided. As such,

it's important to avoid parsing issues due to that text.
Git solves this by indenting this content 4 spaces. We're leaving

indentation as a recommendation, and adding an indent= option for

preamble sections to hint to the parser how much space to strip away

from each line.

Built the docs. Checked the code samples and new text for errors.