2.x: Fix Javadoc warnings on empty <p>

Author: akarnokd

src/main/java/io/reactivex/Flowable.java

@@ -5481,7 +5481,7 @@ public final T blockingFirst(T defaultItem) {
      * <em>Note:</em> the method will only return if the upstream terminates or the current
      * thread is interrupted.
      * <p>
-     * <p>This method executes the {@code Consumer} on the current thread while
+     * This method executes the {@code Consumer} on the current thread while
      * {@link #subscribe(Consumer)} executes the consumer on the original caller thread of the
      * sequence.
      * <dl>

src/main/java/io/reactivex/Observable.java

@@ -5027,7 +5027,7 @@ public final T blockingFirst(T defaultItem) {
      * <em>Note:</em> the method will only return if the upstream terminates or the current
      * thread is interrupted.
      * <p>
-     * <p>This method executes the {@code Consumer} on the current thread while
+     * This method executes the {@code Consumer} on the current thread while
      * {@link #subscribe(Consumer)} executes the consumer on the original caller thread of the
      * sequence.
      * <dl>