gerrit.py: correct docstring's range of CQ ready values

BUG=None
TEST=./gerrit help string now shows correct range of values for ready
field

Change-Id: Idf636b1ef6ffee9b711eeb8b4523b9abcb928ff4
Reviewed-on: https://chromium-review.googlesource.com/203441
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
diff --git a/scripts/gerrit.py b/scripts/gerrit.py
index 1832e2f..ac3510d 100644
--- a/scripts/gerrit.py
+++ b/scripts/gerrit.py
@@ -223,7 +223,7 @@
 
 
 def UserActReady(opts, idx, num):
-  """Mark CL <n> with ready status [-1,0,1]"""
+  """Mark CL <n> with ready status [0,1,2]"""
   opts.gerrit.SetReview(idx, labels={'Commit-Queue': num})