autotest: correct a misleading docstring

This string is not in fact JSON (at least not always), I see it being
logged as a python dict literal sometimes. Looks suspiciously similar,
but not parseable JSON.

BUG=None
TEST=None

Change-Id: I2b556fd47f6ff8854da831e627783cfe59986a6a
Reviewed-on: https://chromium-review.googlesource.com/c/1274053
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Alex Zamorzaev <zamorzaev@chromium.org>
diff --git a/scheduler/shard/shard_client.py b/scheduler/shard/shard_client.py
index 7d9d0ac..e8180f6 100755
--- a/scheduler/shard/shard_client.py
+++ b/scheduler/shard/shard_client.py
@@ -130,7 +130,8 @@
 
         Deserialize a list of JSON-formatted data to database using Django.
 
-        @param serialized_list: A list of JSON-formatted data.
+        @param serialized_list: A list of JSON-formatted data or python dict
+                                literals.
         @param djmodel: Django model type.
         @param message: A string to be used in a logging message.
         """