Update notes for submitted changes

* DfsReaderIoStats: Clarify that "blocks" are really cache misses

87/9372eb72d8b8a073f4f73d98caa1cd15971bd5

@@ -0,0 +1,7 @@
+Verified+1: Hudson CI
+Code-Review+2: Terry Parker <tparker@google.com>
+Submitted-by: Terry Parker <tparker@google.com>
+Submitted-at: Thu, 22 Feb 2018 10:42:53 -0500
+Reviewed-on: https://git.eclipse.org/r/115264
+Project: jgit/jgit
+Branch: refs/heads/master