fix relative-json-pointer xml character entities used in CDATA

Author: notEthan

relative-json-pointer.xml

@@ -91,7 +91,7 @@
                 </preamble>
                 <artwork>
 <![CDATA[
-   relative-json-pointer =  non-negative-integer &lt;json-pointer&gt;
+   relative-json-pointer =  non-negative-integer <json-pointer>
    relative-json-pointer =/ non-negative-integer "#"
    non-negative-integer      =  %x30 / %x31-39 *( %x30-39 )
            ; "0", or digits without a leading "0"