Warning about simple queries

Just saw you added this - really nice listing - and useful when you can use them.

I started using them and then had to back out as they aren't dependable. I didn't realize how limited they were.

Your library and docs just keep getting better and better. Thank you!

Author: wshayes

docs/simple.rst

@@ -1,6 +1,8 @@
 Simple Queries
 --------------
 
+.. caution:: There is no option to add a TTL (Time to live) or batch size optimizations to the Simple Queries due to how Arango is handling simple collection HTTP requests. Your request may time out and you'll see a CursorNextError exception. The AQL queries provide full functionality.
+
 Here is an example of using ArangoDB's **simply queries**:
 
 .. testcode::
@@ -60,4 +62,4 @@ Here are all simple query (and other utility) methods available:
 * :func:`arango.collection.StandardCollection.update_match`
 * :func:`arango.collection.StandardCollection.replace_match`
 * :func:`arango.collection.StandardCollection.delete_match`
-* :func:`arango.collection.StandardCollection.import_bulk`
+* :func:`arango.collection.StandardCollection.import_bulk`