type mistake

Author: JPryce-Aklundh

modules/ROOT/pages/deprecations-additions-removals-compatibility.adoc

@@ -1581,7 +1581,7 @@ Extended xref:expressions/predicates/type-predicate-expressions.adoc[type predic
 The newly supported types are:
 
 * `NOTHING`
-* `null`
+* `NULL`
 * `BOOLEAN NOT NULL`
 * `STRING NOT NULL`
 * `INTEGER NOT NULL`