Fix typo

Author: handrews

jsonschema-hyperschema.xml

@@ -57,7 +57,7 @@
 
         <abstract>
             <t>
-                JSON Schema is a JSON based-format for describing JSON data using various
+                JSON Schema is a JSON-based format for describing JSON data using various
                 vocabularies.  This document specifies a vocabulary for annotating JSON
                 documents with hyperlinks.  These hyperlinks include attributes describing
                 how to manipulate and interact with remote resources through hypermedia