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Still on the 10.15 SDK, so still no real change here.

I again locally removed libcodedirectory.dylib from the .yaml file
when running the script.

Tweak the instructions in the yaml file a bit. I used to copy over
the whole Xcode app, which used to take a few minutes. The new
process only takes seconds.

Also add a word of caution that following these instructions doesn't
update the locally used Xcode in itself.

Bug: 1108831
Change-Id: I3b3f3d698378c347161118ba59ce49a6e23ab891
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490920
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819638}