Changes to Get Self Serve Opp Team Stats

the header request parameter League became required

the header request parameter x-api-key became required

header request parameter League list-of-types was narrowed by removing types null

header request parameter x-api-key list-of-types was narrowed by removing types null

for the header request parameter League, the type was generalized from no type to string

for the header request parameter x-api-key, the type was generalized from no type to string