Fix javadoc warnings

src/main/java/org/assertj/core/api/Assertions.java

@@ -1380,6 +1380,7 @@ public static <T> T failBecauseExceptionWasNotThrown(Class<? extends Throwable>
   /**
    * Throws an {@link AssertionError} with a message explaining that a {@link Throwable} of given class was expected to be thrown
    * but had not been.
+   * @param <T> dummy return value type
    * @param throwableClass the Throwable class that was expected to be thrown.
    * @return nothing, it's just to be used in doSomething(optional.orElse(() -&gt; shouldHaveThrown(IOException.class)));.
    * @throws AssertionError with a message explaining that a {@link Throwable} of given class was expected to be thrown but had

src/main/java/org/assertj/core/util/Streams.java

@@ -23,6 +23,9 @@ public class Streams {
   /**
    * Returns a sequential {@link Stream} of the contents of {@code iterable}, delegating to {@link
    * Collection#stream} if possible.
+   * @param <T> the stream type
+   * @param iterable the iterable to built the stream from
+   * @return the stream built from the given {@link Iterable}
    */
   public static <T> Stream<T> stream(Iterable<T> iterable) {
     return (iterable instanceof Collection)