Clean up misc Javadoc and deprecation warnings

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=136156922

javatests/google/registry/testing/DomainApplicationSubject.java

@@ -54,7 +54,7 @@ public final class DomainApplicationSubject
         ImmutableSet.copyOf(actual().getEncodedSignedMarks()),
         ImmutableSet.of(encodedSignedMarks))) {
       assertThat(actual().getEncodedSignedMarks())
-          .named("the encoded signed marks of " + getDisplaySubject())
+          .named("the encoded signed marks of " + actualAsString())
           .containsExactly((Object[]) encodedSignedMarks);
     }
     return andChainer();