vars: We now have a script for build id

TODO: Fully automate
Change-Id: Ibdcd15f24cbe6477ac84d63f019ff1f145fa2def
diff --git a/vars/redbull b/vars/redbull
index 7f774c9..99c8027 100644
--- a/vars/redbull
+++ b/vars/redbull
@@ -1,6 +1,6 @@
 # Pixel 4a (5G), 5, 5a
 
-# Updated manually
+# Updated semi-manually via pixel/update-any-var.sh
 
 readonly prev_kernel_tag=android-12.1.0_r0.26 # Jun 2022
 readonly kernel_tag=android-12.1.0_r0.33 # Jul 2022