doc: Update README after filename change (Replicates bitcoin 12363) (#3637)
doc: Update README after filename change (Replicates bitcoin 12363) (#3637)

wallet-hd -> wallet_hd

Signed-off-by: pasta <46139b0b16d7696468a818ef81ab82a93691f7d5@dashboost.org>
dashpay/dash,dashpay/dash,dashpay/dash,thelazier/dash,thelazier/dash,dashpay/dash,UdjinM6/dash,UdjinM6/dash,dashpay/dash,thelazier/dash,UdjinM6/dash,thelazier/dash,UdjinM6/dash,thelazier/dash,UdjinM6/dash