function whitelistedSections( section ) {
		var idx;

		idx = indexOf( SECTIONS, section.title );
		if ( idx === -1 ) {
			context.report( 'Only use one of the following section header titles: '+SECTIONS.join( '\n' ), section );
		}
	}
Checks whether a function documentation section has a whitelisted section header.

@private
@param {Object} section - any documentation section