test: minor cleanup of scenarios after merge of 3287 (#3304)

Author: BenWhitehead

google-cloud-storage/src/test/java/com/google/cloud/storage/it/ITNestedUpdateMaskTest.java

@@ -96,7 +96,8 @@ public static final class NestedUpdateMaskParametersProvider implements Paramete
      * | {"k1":"a","k2":"b"} | {"k2":null}          | {"k1":"a"}          |
      * | {"k1":"a"}          | {}                   | null                |
      * | {"k1":"a"}          | {"k1":null}          | null                |
-     * | {"k1":"a","k2":"b"} | {"k1:null,"k2":null} | null                |
+     * | {"k1":"a","k2":"b"} | null                 | null                |
+     * | {"k1":"a","k2":"b"} | {"k1":null,"k2":null}| null                |
      * </pre>
      */
     @Override
@@ -112,7 +113,8 @@ public ImmutableList<Param> parameters() {
           new Param("2 keys, modify 1 null (fine)", k1a_k2b, k2null, k1a),
           new Param("1 key, set empty", k1a, empty, null),
           new Param("1 key, null key", k1a, k1null, null),
-          new Param("2 keys, set null", k1a_k2b, k1null_k2null, null));
+          new Param("2 keys, set null (full)", k1a_k2b, null, null),
+          new Param("2 keys, set null (fine)", k1a_k2b, k1null_k2null, null));
     }
   }