def update_member_data_in(self, leaderboard_name, member, member_data):
self.redis_connection.hset(<EOL>self._member_data_key(leaderboard_name),<EOL>member,<EOL>member_data)<EOL>
Update the optional member data for a given member in the named leaderboard.

@param leaderboard_name [String] Name of the leaderboard.
@param member [String] Member name.
@param member_data [String] Optional member data.