address comments

sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/DoFn.java

@@ -407,8 +407,8 @@ public interface MultiOutputReceiver {
  * choose to defer fetching state until read() is called. Annotating a state argument with this
  * parameter provides a hint to the runner that the state is always fetched. This may cause the
  * runner to prefetch all the state before calling the processElement or processTimer method,
- * improving performance. This is a performance-only hint - it does not change semantics.
- * See the following code for an example:
+ * improving performance. This is a performance-only hint - it does not change semantics. See the
+ * following code for an example:
  *
  * <pre><code>{@literal new DoFn<KV<Key, Foo>, Baz>()} {
  *
@@ -426,13 +426,8 @@ public interface MultiOutputReceiver {
  * }
  * </code></pre>
  *
- * <p>State is subject to the following validity conditions:
- *
- * <ul>
- * <li>Each state ID must be declared at most once.
- * <li>Any state referenced in a parameter must be declared with the same state type.
- * <li>State declarations must be final.
- * </ul>
+ * <p>This can only be used on state objects that implement {@link
+ * org.apache.beam.sdk.state.ReadableState}.
  */
  @Documented
  @Retention(RetentionPolicy.RUNTIME)