This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (recipe_engine) into this repository.

recipe_engine:
  https://crrev.com/1b1574d044a7f44430825aa929cdc5b4fe17ab7b (erikchen@chromium.org)
    Update user guide.

More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.

TBR=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I8aa0e687647a484b4bf08eb4928b10fb94de666a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2173836Reviewed-by: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>