Clarify guice upgrade in 2.16.18

Change-Id: Ic88640fa06b6b0796dfa8d42071d515ebbff0021
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index 3c31b66..0dc9cc5 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -862,7 +862,7 @@
     warning when building. See [PR 478](https://github.com/bazelbuild/rules_closure/pull/478).
 
   * [Issue 12448](https://bugs.chromium.org/p/gerrit/issues/detail?id=12448):
-  Switch to using no-AOP Guice distribution
+  Upgrade Guice to 4.2.3 and switch to using no-AOP Guice distribution
 
     This allows to more easily support newer JDK versions.