message: Fix Javadoc reference to Key.getIdRequirementOrNull().
diff: @@ -34,8 +34,8 @@ public abstract class Parameters {
  *
  * <p>In Tink, certain keys change their behavior depending on the key id (for example, an {@link
  * Aead} object can prefix the ciphertext with the big endian encoding of the key id). If this is
  - * the case, such a key should require a unique id in {@link Key#getIdRequirement} and return true
  - * here.
  + * the case, such a key should require a unique id in {@link Key#getIdRequirementOrNull} and
  + * return true here.
  */
  public abstract boolean hasIdRequirement();
  }
  