Changeset 3626 for sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/reference/template-source.php

developer.wordpress.org: Restructure reference pages to leverage a table of contents for the majority of the page output.

• Splits large sections of content-reference.php into individual template parts captured via output buffering.
• Introduces four top-level sections for any given reference page: Description, More Information (if an explanation exists), Related, and User Contributed Notes
• Improves overall responsive styling for smaller viewports

See #1802.