Fix more examples for $anchor and canonical $id

Author: handrews

jsonschema-core.xml

@@ -2104,7 +2104,7 @@
     },
     "$defs": {
         "single": {
-            "$id": "#item",
+            "$anchor": "item",
             "type": "object",
             "additionalProperties": { "$ref": "other.json" }
         }
@@ -2892,8 +2892,8 @@ https://json-schema.org/draft/2019-08/schema#/$defs/nonNegativeInteger/minimum
                     <artwork>
 <![CDATA[
 {
-  "$id": "https://example.com/polygon#",
-  "$schema": "https://json-schema.org/draft/2019-08/schema#",
+  "$id": "https://example.com/polygon",
+  "$schema": "https://json-schema.org/draft/2019-08/schema",
   "$defs": {
     "point": {
       "type": "object",
@@ -3113,8 +3113,8 @@ https://json-schema.org/draft/2019-08/schema#/$defs/nonNegativeInteger/minimum
 <![CDATA[
 // schema
 {
-  "$id": "https://example.com/polygon#",
-  "$schema": "https://json-schema.org/draft/2019-08/schema#",
+  "$id": "https://example.com/polygon",
+  "$schema": "https://json-schema.org/draft/2019-08/schema",
   "type": "object",
   "properties": {
     "validProp": true,