Update Javadoc URL on Value

Value is no longer experimental, so (as the person who raised the issue
suggested) the Javadoc should no longer point to the 'experimental'
documentation. Fixes #1091

src/core/lombok/Value.java

@@ -31,7 +31,7 @@ import java.lang.annotation.Target;
  * <p>
  * Equivalent to {@code @Getter @FieldDefaults(makeFinal=true, level=AccessLevel.PRIVATE) @AllArgsConstructor @ToString @EqualsAndHashCode}.
  * <p>
- * Complete documentation is found at <a href="https://projectlombok.org/features/experimental/Value.html">the project lombok features page for &#64;Value</a>.
+ * Complete documentation is found at <a href="https://projectlombok.org/features/Value.html">the project lombok features page for &#64;Value</a>.
  * 
  * @see lombok.Getter
  * @see lombok.experimental.FieldDefaults