Update W3F URL links (#10374)

substrate/frame/staking/src/slashing.rs

@@ -47,7 +47,7 @@
 //! has multiple misbehaviors. However, accounting for such cases is necessary
 //! to deter a class of "rage-quit" attacks.
 //!
-//! Based on research at <https://w3f-research.readthedocs.io/en/latest/polkadot/slashing/npos.html>
+//! Based on research at <https://research.web3.foundation/en/latest/polkadot/slashing/npos.html>
 
 use crate::{
 	BalanceOf, Config, EraIndex, Error, Exposure, NegativeImbalanceOf, Pallet, Perbill,

substrate/frame/transaction-payment/src/lib.rs

@@ -127,7 +127,7 @@ type BalanceOf<T> = <<T as Config>::OnChargeTransaction as OnChargeTransaction<T
 /// Meaning that fees can change by around ~23% per day, given extreme congestion.
 ///
 /// More info can be found at:
-/// <https://w3f-research.readthedocs.io/en/latest/polkadot/Token%20Economics.html>
+/// <https://research.web3.foundation/en/latest/polkadot/overview/2-token-economics.html>
 pub struct TargetedFeeAdjustment<T, S, V, M>(sp_std::marker::PhantomData<(T, S, V, M)>);
 
 /// Something that can convert the current multiplier to the next one.