Update dcat/index.html according to dave's suggestions

dcat/index.html

@@ -57,7 +57,7 @@ <h3 id="external_terms">External terms</h3>
     <p>DCAT incorporates terms from pre-existing vocabularies where stable terms with appropriate meanings could be found, such as <a href="http://xmlns.com/foaf/0.1/homepage"><code>foaf:homepage</code></a> and <a href="http://purl.org/dc/terms/title"><code>dct:title</code></a>.
       Informal summary definitions of the externally-defined terms are included in the DCAT vocabulary for convenience, while authoritative definitions are available in the normative references.
       Changes to definitions in the references, if any, supersede the summaries given in this specification.
-      Note that conformance to DCAT (<a href="#conformance"></a>) concerns usage of only the terms in the DCAT vocabulary specification, so possible changes to the external definitions will not affect the conformance of DCAT implementations.</p>
+      Note that conformance to DCAT (<a href="#conformance"></a>) concerns usage of only the terms in the DCAT vocabulary specification, so possible changes to other external definitions will not affect the conformance of DCAT implementations.</p>
 
     <h3 id="please_send_comments">Please send comments</h3>
     The Working Group invites publishers to describe their catalogs and datasets with the revised version of DCAT described in this document and to report their implementations following <a href="https://github.com/w3c/dxwg/wiki/DCAT-implementation-evidence">the instruction  to reporting DCAT revised implementations</a>. The information gathered through this means will be augmented by further analysis of implementation available on the Web. The Working Group expects to adduce the combined set of evidence when requesting that the Director advance this document to Proposed Recommendation.