android_sdk: Add step to update instructions

capturing other things to update.

Bug: None
Change-Id: I43cdfc6dc4c0771a9fae9b0b17cee30ce3ce8db1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3747161
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1023236}
NOKEYCHECK=True
GitOrigin-RevId: f53a226b036b41f4d553d3da209740dbac7e1e35