SkMatrix44 is deprecated: use SkM44 instead

Change-Id: I9a269b9c0c3cda29d06827d016db3a3f963a91fd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/283504
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index cf6b62c..fc3f1b9 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -8,7 +8,7 @@
 
   * <insert new release note here>
 
-  * SkCamera.h and all of its contained classes are DEPRECATED.
+  * SkCamera.h and SkMatrix44.h are DEPRECATED.
     Use SkM44 if you want to have 3d transformations.
 
   * Changed Dilate and Erode image filters to take SkScalar for radius instead of int. While