ninjalog: fix ninjalog.README.md

We don't use goma auth-info anymore.

Change-Id: Id20a98018c2620ebe7c26e158b595487b0b03b47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5394918
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Junji Watanabe <jwata@google.com>
Commit-Queue: Junji Watanabe <jwata@google.com>

ninjalog.README.md

@@ -14,7 +14,7 @@ $ autoninja -C out/Release chrome
 autoninja uploads ninja's build log for Google employees but we don't collect
 logs from external contributors.
 
-We use `goma_auth info` to decide whether an autoninja user is a Googler or not.
+We use `cipd auth-info` to decide whether an autoninja user is a Googler or not.
 
 Before uploading logs, autoninja shows a message 10 times to warn users that we
 will collect build logs.