Update epub34/authoring/index.html

Co-authored-by: Ivan Herman <[email protected]>

Author: mattgarrish

epub34/authoring/index.html

@@ -5858,7 +5858,7 @@ <h4>Introduction</h4>
 							the use of the XML syntax. XML, however, is integral to many publishing workflows and
 							expected in many vendor ingestion systems and reading systems. It is also not expected that
 							support for XHTML will be dropped from browsers, even if there are additional support
-							differences between the syntax in the future. Support for the HTML syntax will be addressed
+							differences between the syntax in the future. Support for the HTML syntax may be addressed
 							in a successor format to EPUB 3.</p>
 					</div>