Document section is portion of the extension point schema
definition that will be taken and built into the final reference
HTML document. There are several predefined document sections
that PDE recognizes:
MARKUP - will be used for "Markup" section
EXAMPLES - will be used for "Examples" section
API_INFO - will be used for "API information" section
IMPLEMENTATION - will be used for "Supplied Implementation" section
Text that objects of this class carry can contain HTML tags that
will be copied into the target document as-is.