fix(spec-tools): Fix lint by adding TODO docstring for Amsterdam init

Author: fselmo

src/ethereum/forks/amsterdam/__init__.py

@@ -1,4 +1,9 @@
+"""
+The Amsterdam fork.
 
-from ethereum.fork_criteria import Unscheduled, ForkCriteria
+TODO: Update with information for included EIPs as other forks do.
+"""
+
+from ethereum.fork_criteria import ForkCriteria, Unscheduled
 
 FORK_CRITERIA: ForkCriteria = Unscheduled(order_index=0)