Unhide DelegateLastClassLoader.

This also requires a minor javadoc fix in order to make docs work
correctly.

Test: make update-api; make checkapi

Bug: 37966546
Change-Id: I674fe14c454e62bbfd63f0a29eaf3609853021af
(cherry picked from commit 0209ec7e3c608acc3f1b63413686a3391551dcd5)
diff --git a/dalvik/src/main/java/dalvik/system/DelegateLastClassLoader.java b/dalvik/src/main/java/dalvik/system/DelegateLastClassLoader.java
index b15175e..4b29902 100644
--- a/dalvik/src/main/java/dalvik/system/DelegateLastClassLoader.java
+++ b/dalvik/src/main/java/dalvik/system/DelegateLastClassLoader.java
@@ -30,11 +30,9 @@
  * <ul>
  *     <li>The boot classpath is always searched first</li>
  *     <li>Then, the list of {@code dex} files associated with this classloaders's
- *     {@code dexPath} is searched./li>
+ *     {@code dexPath} is searched.</li>
  *     <li>Finally, this classloader will delegate to the specified {@code parent}.</li>
  * </ul>
- *
- * @hide
  */
 public final class DelegateLastClassLoader extends PathClassLoader {
 
@@ -148,4 +146,4 @@
 
         return new CompoundEnumeration<>(resources);
     }
-}
\ No newline at end of file
+}