Mention how to turn warning to exceptions
Mention how to turn warning to exceptions

This helps locating the offending code, since the reported
warning location is not always correct.

References: #6241
Change-Id: I85d3a20e5b428a5003b541b36b9a77f1d7c1acb6

monetate/sqlalchemy,j5int/sqlalchemy,zzzeek/sqlalchemy,j5int/sqlalchemy,sqlalchemy/sqlalchemy,monetate/sqlalchemy