Fix lack of keyword quotes in changelog

Author: handrews

jsonschema-core.xml

@@ -3758,8 +3758,8 @@ User-Agent: product-name/5.4.1 so-cool-json-schema/1.0.2 curl/7.43.0
                             <t>Allow "schema" media type parameter for "application/schema+json"</t>
                             <t>Better explanation of media type parameters and the HTTP Accept header</t>
                             <t>Use "$id" to establish canonical and base absolute-URIs only, no fragments</t>
-                            <t>Replace plain-name-fragment-only form of $id with $anchor</t>
-                            <t>Clarified that the behavior of JSON Pointers across $id boundary is unreliable</t>
+                            <t>Replace plain-name-fragment-only form of "$id" with "$anchor"</t>
+                            <t>Clarified that the behavior of JSON Pointers across "$id" boundary is unreliable</t>
                         </list>
                     </t>
                     <t hangText="draft-handrews-json-schema-01">