Update events.adoc

chapters/events.adoc

@@ -960,7 +960,7 @@ seen by consumers -
 * Changing the order of values with same type in an array.
 * Removing optional fields.
 * Removing an individual value from an enumeration.
-* Adding new value to a `x-extensible-enum` field (see <<112, rule 112>> and <<108, rule 108>>).
+* Adding new value to a {x-extensible-enum} field (see <<112, rule 112>> and <<108, rule 108>>).
 
 These are considered backwards-incompatible changes, as seen by
 consumers -