Retired Documentation: You are using the documentation for version 1.7.3 which was retired in 2013. Go here for the latest version documentation or check here for your available upgrades to the latest version.
ExpressionEngine Add-On Development Guidelines
Writing Documentation
To help facilitate a consistent, easy-to-read documentation style for ExpressionEngine add-ons, Ellislab is making the markup and CSS from the ExpressionEngine user guide freely available to the community for their use. For your convenience, a template file has been created that includes the primary blocks of markup used with brief samples.
Don't forget to change the relative link to the stylesheet, your URL in the Google search bar, and the other links, such as to your add-on's home page and the breadcrumb links!