San Francisco Mayor London Breed has directed the Police Department to ramp up foot patrols around the Mid-Market corridor — it’s the latest incremental step in the city’s effort to rejuvenate the area and rid it of the drug pushers that have long congregated there. On Wednesday, Breed is expected to announce that 10 additional officers, two sergeants and a lieutenant will be reassigned to the SFPD’s Tenderloin Station.