docs(bitswap/notifications)

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
fix(bitswap/notifications) subscribe to many

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
tests(bitswap/notifications) test niladic

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>