Rephrase some Javadoc

As suggested by @delvh.

event-bus-core/src/main/java/dev/kske/eventbus/core/EventBus.java

@@ -75,14 +75,15 @@ public final class EventBus {
 	private final Map<Class<?>, TreeSet<EventHandler>> bindings = new ConcurrentHashMap<>();
 
 	/**
-	 * Registered listeners.
+	 * Stores all registered event listeners (which declare event handlers) and prevents them from
+	 * being garbage collected.
 	 *
 	 * @since 0.0.1
 	 */
 	private final Set<Object> registeredListeners = ConcurrentHashMap.newKeySet();
 
 	/**
-	 * Thread-local dispatch state.
+	 * The current event dispatching state, local to each thread.
 	 *
 	 * @since 0.1.0
 	 */

event-bus-core/src/main/java/dev/kske/eventbus/core/EventBusException.java

@@ -4,7 +4,7 @@ package dev.kske.eventbus.core;
  * This unchecked exception is specific to the event bus and can be thrown under the following
  * circumstances:
  * <ul>
- * <li>An event handler throws an exception (which is stores as the cause)</li>
+ * <li>An event handler throws an exception (which is stored as the cause)</li>
  * <li>An event listener with an invalid event handler is registered</li>
  * <li>{@link EventBus#cancel()} is invoked from outside an active dispatch thread</li>
  * </ul>