This CL reorders the update steps physically, to make them easier to comprehend. It renames variables to be more verbose, but also adds succinct mathematical descriptions (using Wikipedia notation) to all steps. No functional changes are intended with this change. Bug: webrtc:14151 Change-Id: I6a4642e89e2b73639f0b4c928e07b317c14d5884 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/271546 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37784}