Change wording in 5.3 release notes.

Change-Id: I3ecae4c7b1e7e4251835b8ec4621880dc3add59f

Releases.md

diff --git a/Releases.md b/Releases.md
index 3787bd6..efb489a 100644
--- a/Releases.md
+++ b/Releases.md
@@ -8,11 +8,14 @@
 
 ## 5.3 (eagle)
 
-+   Updated to latest ML release
++   Updated preinstalled packages (python3-pycoral, libedgetpu1-std,
+    python3-edgetpuvision) to grouper ML release
 +   Fixed boot from SD cards
 +   Fixed MDT compatibility with Python 3.9
 +   Added backup apt sources
 
+New Mendel 5.3 image is released for the Coral Dev Board and SoM (file
+version `20211117215217`).
 
 ## 5.2 (eagle)