Fix a small typo in api.py
Fix a small typo in api.py

Change 'choosen' to 'chosen'

Change-Id: I07d420c2c2cddbb5d5eeb9a25f172f775d598fec

vikt0rs/oslo.db,magic0704/oslo.db,varunarya10/oslo.db,JioCloud/oslo.db,openstack/oslo.db,openstack/oslo.db,malor/oslo.db,akash1808/oslo.db