GetAddressOf message is missing a comma causing an >80 char message

Adding the comma in so the message looks right!

Change-Id: I2b2ee8da289df56914e986f36548f1fa03bfdb02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406672
Auto-Submit: Joshua Berenhaus <joshber@microsoft.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806295}

PRESUBMIT.py

@@ -951,7 +951,7 @@ _BANNED_CPP_FUNCTIONS = (
       (
         'Improper use of Microsoft::WRL::ComPtr<T>::GetAddressOf() has been ',
         'implicated in a few leaks. ReleaseAndGetAddressOf() is safe but ',
-        'operator& is generally recommended. So always use operator& instead. '
+        'operator& is generally recommended. So always use operator& instead. ',
         'See http://crbug.com/914910 for more conversion guidance.'
       ),
       True,