Provide the reason for the test skips. (#1584)

Author: vbabanin

driver-sync/src/test/functional/com/mongodb/client/unified/UnifiedTestModifications.java

@@ -48,7 +48,7 @@ public static void doSkips(final TestDef def) {
 
         def.skipNoncompliantReactive("error required from change stream initialization") // TODO reason?
                 .test("change-streams", "change-streams", "Test with document comment - pre 4.4");
-        def.skipNoncompliantReactive("event sensitive tests") // TODO reason?
+        def.skipNoncompliantReactive("event sensitive tests. We can't guarantee the amount of GetMore commands sent in the reactive driver")
                 .test("change-streams", "change-streams", "Test that comment is set on getMore")
                 .test("change-streams", "change-streams", "Test that comment is not set on getMore - pre 4.4");
         def.modify(IGNORE_EXTRA_EVENTS)