Add an indent option for preamble text.

Review Request #11697 — Created July 1, 2021 and submitted — Latest diff uploaded

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master

Reviewers

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.

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