fix RST link format
fix RST link format

Change-Id: I52122759a92d2fa4bab93ac75c21a77f79eace5a

wujuguang/sqlalchemy,graingert/sqlalchemy,j5int/sqlalchemy,graingert/sqlalchemy,wujuguang/sqlalchemy,monetate/sqlalchemy,zzzeek/sqlalchemy,monetate/sqlalchemy,j5int/sqlalchemy,sqlalchemy/sqlalchemy