Merge pull request #544 from w3c/page-reference

Added a note about the page break source to navigation before examples

a11y-meta-display-guide/2.0/draft/guidelines/index.html

@@ -1198,6 +1198,8 @@ <h3 data-localization-id="navigation-title">Navigation</h3>
 						href="https://www.w3.org/TR/WCAG21/#multiple-ways">Success
 						Criterion 2.4.5 Multiple
 						Ways</a></cite>).</p>
+<div class="note"><p>While not required if available, it may be helpful to identify the bibliographic information about the page break source identified in metadata of the digital publication. Having sufficient information to identify the print source would assure students and educators that the digital version they are using is correctly associated with the print version used in the classroom. The goal is to have the go to page function take the digital user to the same page as the print version user.
+</p></div>
 
 			<section id="nav-examples">
 				<h4>Examples</h4>