Document behaviour of executemany (#213)

Signed-off-by: Martin Rueckl <enigma@nbubu.de>
Signed-off-by: Sai Shree Pradhan <saishree.pradhan@databricks.com>

Author: martinitus

src/databricks/sql/client.py

@@ -701,8 +701,10 @@ def execute(
 
     def executemany(self, operation, seq_of_parameters):
         """
-        Prepare a database operation (query or command) and then execute it against all parameter
-        sequences or mappings found in the sequence ``seq_of_parameters``.
+        Execute the operation once for every set of passed in parameters.
+
+        This will issue N sequential request to the database where N is the length of the provided sequence.
+        No optimizations of the query (like batching) will be performed.
 
         Only the final result set is retained.