Fix some documentation

src/main/java/de/siphalor/was/content/pack/ContentPack.java

@@ -21,7 +21,7 @@ public interface ContentPack {
 
 	/**
 	 * Gets the resource with the specified identifier.
-	 * @param identifier
+	 * @param identifier The resource identifier
 	 * @return The resource or <code>null</code> if it doesn't exist
 	 */
 	@Nullable

src/main/java/de/siphalor/was/content/quest/Quest.java

@@ -61,8 +61,8 @@ public class Quest {
 	}
 
 	/**
-	 * Represents the type of a quest. <br />
-	 * <code>IN</code> for incoming (store) <br />
+	 * Represents the type of a quest. <br>
+	 * <code>IN</code> for incoming (store) <br>
 	 * <code>OUT</code> for outgoing (deliver)
 	 */
 	public enum Type {

src/main/java/de/siphalor/was/util/PersistentInputStream.java

@@ -7,8 +7,8 @@ import java.io.IOException;
 import java.io.InputStream;
 
 /**
- * An input stream that can be reused. <br />
- * Close with {@link PersistentInputStream#realClose()} <br />
+ * An input stream that can be reused. <br>
+ * Close with {@link PersistentInputStream#realClose()} <br>
  * <b>Taken from here: https://stackoverflow.com/questions/924990/how-to-cache-inputstream-for-multiple-use#1303314</b>
  */
 public class PersistentInputStream extends BufferedInputStream {