The URI-references without fragment was remove

Author: Dule-martins

pages/understanding-json-schema/structuring.md

@@ -566,9 +566,4 @@ In Draft 4-7, a subschema `$id` is just a base URI change and not
    using subschema `$id` must use the same dialect.
 </Infobox>
 
-<Infobox label="Draft-specific info">
-In Draft 2020-12,`$id` support for changing dialects in an embedded schema 
-   (using $schema with a different value than the parent schema) was added.
-   In 2020-09, Only URI-references without fragments are allowed;
-   all other fragments in $id had undefined behavior previously.   
-</Infobox>
+