[Misc] Document backport of isolated macro execution feature

Author: michitux

xwiki-rendering-transformations/xwiki-rendering-transformation-macro/src/main/java/org/xwiki/rendering/internal/transformation/macro/IsolatedExecutionConfiguration.java

@@ -36,6 +36,7 @@
  *
  * @version $Id$
  * @since 17.3.0RC1
+ * @since 16.10.9
  */
 @Component(roles = IsolatedExecutionConfiguration.class)
 @Singleton

xwiki-rendering-transformations/xwiki-rendering-transformation-macro/src/main/java/org/xwiki/rendering/macro/Macro.java

@@ -96,6 +96,7 @@ default void prepare(MacroBlock macroBlock) throws MacroPreparationException
      * A macro needs to return {@code false} if it executes macro transformations with macros it doesn't know
      * (e.g., parsed from its content or another page) with the XDOM or the macro block accessible for these macros.
      * @since 17.3.0RC1
+     * @since 16.10.9
      */
     @Unstable
     default boolean isExecutionIsolated(P parameters, String content)