Also fix the name of the docs/building.md file.
Bug:
Change-Id: I342adcbc1427c533d2248d23d53f169d4a4a54cd
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/34466
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Auto-Submit: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>