cbuildbot.py: Correct an argument help string.

The given argument help string is technically out of date as of
CL:I8a3b929d4fbe6e4b0c26c5fbfcbfc50b52b58cc6

BUG=None
TEST=None

Change-Id: I8cf37afc6d2e58448ab80a745af7fc16d6735098
Reviewed-on: https://chromium-review.googlesource.com/179853
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
diff --git a/scripts/cbuildbot.py b/scripts/cbuildbot.py
index 1639473..0726077 100644
--- a/scripts/cbuildbot.py
+++ b/scripts/cbuildbot.py
@@ -1152,7 +1152,7 @@
                           default=None,
                           help=
       "If given, this gerrit query will be used to find what patches to test, "
-      "rather than the normal 'CommitQueue=1 AND Verified=1 AND CodeReview=2' "
+      "rather than the normal 'CommitQueue>=1 AND Verified=1 AND CodeReview=2' "
       "query it defaults to.  Use with care- note additionally this setting "
       "only has an effect if the buildbot target is a cq target, and we're "
       "in buildbot mode.")