Add missing diff caches to miss ratio panels

Change-Id: I6c2d5e9d523f4902e79dabac3780a59d37fb2c3c

dashboards/gerrit/caches/panels/diff_cache_misses.libsonnet

diff --git a/dashboards/gerrit/caches/panels/diff_cache_misses.libsonnet b/dashboards/gerrit/caches/panels/diff_cache_misses.libsonnet
index 349b71e..92936a8 100644
--- a/dashboards/gerrit/caches/panels/diff_cache_misses.libsonnet
+++ b/dashboards/gerrit/caches/panels/diff_cache_misses.libsonnet
@@ -10,3 +10,5 @@
 .addTarget(target.new('diff'))
 .addTarget(target.new('diff_intraline'))
 .addTarget(target.new('diff_summary'))
+.addTarget(target.new('gerrit_file_diff'))
+.addTarget(target.new('git_file_diff'))