Update epub34/authoring/index.html

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

Author: mattgarrish

epub34/authoring/index.html

@@ -3122,7 +3122,7 @@ <h3>Introduction</h3>
 					<p>A <var>property</var> value is like a CURIE [[rdfa-core]] — it represents a URL [[url]] in
 						compact form. The expression consists of a prefix and a reference, where the prefix — whether
 						literal or implied — is a shorthand mapping of a URL that typically resolves to a term
-						vocabulary. When a [=reading system=] converts the prefix to its URL representation and combines
+						vocabulary. When a [=reading system=] converts the prefix to its URL representation and concatenates
 						with the reference, the resulting URL normally resolves to a fragment within that vocabulary
 						that contains human- and/or machine-readable information about the term.</p>