8274071: Clean up java.lang.ref comments and documentation

Reviewed-by: rriggs, kbarrett, mchung, iris, lancea

Author: pavelrappo

src/java.base/share/classes/java/lang/ref/Reference.java

@@ -134,7 +134,7 @@ public abstract class Reference<T> {
      *   [inactive/unregistered]
      *
      * Unreachable states (because enqueue also clears):
-     *   [active/enqeued]
+     *   [active/enqueued]
      *   [active/dequeued]
      *
      * [1] Unregistered is not permitted for FinalReferences.
@@ -510,8 +510,7 @@ protected Object clone() throws CloneNotSupportedException {
      * this method.  Invocation of this method does not itself initiate garbage
      * collection or finalization.
      *
-     * <p> This method establishes an ordering for
-     * <a href="package-summary.html#reachability"><em>strong reachability</em></a>
+     * <p> This method establishes an ordering for <em>strong reachability</em>
      * with respect to garbage collection.  It controls relations that are
      * otherwise only implicit in a program -- the reachability conditions
      * triggering garbage collection.  This method is designed for use in
@@ -609,7 +608,6 @@ protected Object clone() throws CloneNotSupportedException {
      *
      * @param ref the reference. If {@code null}, this method has no effect.
      * @since 9
-     * @jls 12.6 Finalization of Class Instances
      */
     @ForceInline
     public static void reachabilityFence(Object ref) {