Alphabetize a11y aconfig flags to help limit merge conflicts.

Change-Id: I49d7b92169602c97cff992f44539aaf0e8860669
diff --git a/packages/SystemUI/aconfig/accessibility.aconfig b/packages/SystemUI/aconfig/accessibility.aconfig
index 8841967..bcf1535 100644
--- a/packages/SystemUI/aconfig/accessibility.aconfig
+++ b/packages/SystemUI/aconfig/accessibility.aconfig
@@ -1,5 +1,7 @@
 package: "com.android.systemui"
 
+# NOTE: Keep alphabetized to help limit merge conflicts from multiple simultaneous editors.
+
 flag {
     name: "floating_menu_overlaps_nav_bars_flag"
     namespace: "accessibility"