Whitespace change to test infra

TBR=santa

Change-Id: Ie318314abb2384df22deee4e3e33e2a7139e8d7f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2083482Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66556}

tools/whitespace.txt

@@ -8,7 +8,7 @@ The doubles heard this and started to unbox.
 The Smi looked at them when a crazy v8-autoroll account showed up...
 The autoroller bought a round of Himbeerbrause. Suddenly.....
 The bartender starts to shake the bottles.....................
-I can't add trailing whitespaces, so I'm adding this line...
+I can't add trailing whitespaces, so I'm adding this line....
 I'm starting to think that just adding trailing whitespaces might not be bad.
 
 Because whitespaces are not that funny.....