2.15: Minor fixes in dependency updates

- Remove duplicate listing of gitiles blame cache
- Mention that JGit was updated again in 2.15.6

Change-Id: Ib49423324c8379f57bd80ffc2221078060603eff
diff --git a/pages/site/releases/2.15.md b/pages/site/releases/2.15.md
index 4ea77b4..2908d80 100644
--- a/pages/site/releases/2.15.md
+++ b/pages/site/releases/2.15.md
@@ -375,13 +375,11 @@
 
 * Update Dropwizard to 3.2.4
 
-* Update Gitiles Blame to 0.2-4
-
 * Update GWT to 2.8.1
 
 * Update Jetty to 9.3.18.v20170406
 
-* Update JGit to 4.9.0.201710071750-r
+* Update JGit to 4.9.0.201710071750-r (updated to 4.9.7.201810191756-r in 2.15.6)
 
 * Update Joda-Time to 2.9.9