Fix munged sentence based on PR feedback

Author: handrews

jsonschema-core.xml

@@ -3618,7 +3618,7 @@ User-Agent: product-name/5.4.1 so-cool-json-schema/1.0.2 curl/7.43.0
             </t>
             <t>
                 To make such use case-specific semantics explicit, the best practice
-                is to create an annotation keyword can be created for use in the same
+                is to create an annotation keyword for use in the same
                 schema object alongside of a reference keyword such as "$ref".
             </t>
             <figure>