Mention issue 8740 in 2.16 and 2.15.10 release notes

Change-Id: I312a0f7404df5c4489061bdc9a8dd4480835d073
diff --git a/pages/site/releases/2.15.md b/pages/site/releases/2.15.md
index 19f25a7..2ac4d2d 100644
--- a/pages/site/releases/2.15.md
+++ b/pages/site/releases/2.15.md
@@ -405,7 +405,12 @@
 
 * Add support for Elasticsearch 6.6.
 
-* Add warning that Javascript is required to use PolyGerrit.
+* PolyGerrit fixes
+
+  * Add warning that Javascript is required to use PolyGerrit.
+
+  * [Issue 8740](https://bugs.chromium.org/p/gerrit/issues/detail?id=8740):
+  Disable deps.js requests in the index template to fix page load delay.
 
 ### 2.15.9
 
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index c999bd1..5fe476c 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -522,6 +522,9 @@
 
 #### PolyGerrit
 
+* [Issue 8740](https://bugs.chromium.org/p/gerrit/issues/detail?id=8740):
+  Disable deps.js requests in the index template to fix page load delay.
+
 * [Issue 10371](https://bugs.chromium.org/p/gerrit/issues/detail?id=10371):
   Fix an issue where a saved edit would always restore the same content
   in subsequent edits of the same file, due to the cache not being erased.