docs/updating_clang.md: Fix mac lld copy step

And remove some whitespace while we're here.

TBR=thakis

Bug: none
Change-Id: Iadaaa0606a1f3916c4b3ce354c87b20d1c3318ff
Reviewed-on: https://chromium-review.googlesource.com/711316
Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#507873}
1 file changed