prototype: Fix spelling mistake

BUG=None
TEST=None

Change-Id: I3736f0a560761a6cf8764c9e565b7535f69bee86
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/1988526
Reviewed-by: C Shapiro <shapiroc@chromium.org>
Commit-Queue: C Shapiro <shapiroc@chromium.org>
Tested-by: C Shapiro <shapiroc@chromium.org>
Auto-Submit: C Shapiro <shapiroc@chromium.org>
3 files changed