Update 2.16.5 release notes

- Fix grammar

- Remove section about commit validator message updates; these
  changes were already in the 2.16 release.

Change-Id: I170493a9fd4961ed1d3e066c1b3daddfce616645
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index 6f70aa5..59388bb 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -542,12 +542,10 @@
 
 * [Issue 10401](https://bugs.chromium.org/p/gerrit/issues/detail?id=10401):
   Reimplement the project children API on top of the projects secondary index, which requires
-  a significant less amount heap and CPU.
+  a significantly less amount of heap and CPU.
 
 #### Other fixes
 
-* Improve error messages emitted from commit validators.
-
 * Add support for Elasticsearch 6.6.
 
 ### 2.16.4