fixup do not remove birds feet from Tutorial.lhs

Author: nfrisby

ouroboros-consensus/src/unstable-tutorials/Ouroboros/Consensus/Tutorial/Simple.lhs

@@ -131,34 +131,34 @@ Next, we instantiate the `ConsensusProtocol` for `SP`:
 
 > instance ConsensusProtocol SP where
 >   type SelectView    SP = BlockNo
-
+>
 >   type LedgerView    SP = ()
-
+>
 >   type IsLeader      SP = SP_IsLeader
 >   type CanBeLeader   SP = SP_CanBeLeader
-
+>
 >   type ChainDepState SP = ()
 >   type ValidateView  SP = ()
 >   type ValidationErr SP = Void
-
+>
 >   checkIsLeader cfg SP_CanBeLeader slot _tcds =
 >       if slot `Set.member` cfgsp_slotsLedByMe cfg
 >       then Just SP_IsLeader
 >       else Nothing
-
+>
 >   protocolSecurityParam _cfg = k
-
+>
 >   tickChainDepState _ _ _ _ = TickedTrivial
-
+>
 >   updateChainDepState _ _ _ _ = return ()
-
+>
 >   reupdateChainDepState _ _ _ _ = ()
 
 Finally we define a few extra things used in this instantiation:
 
 > data SP_CanBeLeader = SP_CanBeLeader -- Evidence that we /can/ be a leader
 > data SP_IsLeader = SP_IsLeader       -- Evidence that we /are/ leader
-
+>
 > k :: SecurityParam
 > k = SecurityParam { maxRollbacks = 1 }
 
@@ -535,7 +535,7 @@ number, we materialize that number in the `LedgerState`.  We'll also need to
 keep track of some information about the most recent block we have seen.
 
 > data instance LedgerState BlockC =
-
+>
 >   LedgerC
 >     -- the hash and slot number of the most recent block
 >     { lsbc_tip :: Point BlockC
@@ -570,7 +570,7 @@ types for a ledger.  Though we are here using
 > instance IsLedger (LedgerState BlockC) where
 >   type instance LedgerErr  (LedgerState BlockC) = Void
 >   type instance AuxLedgerEvent (LedgerState BlockC) = Void
-
+>
 >   applyChainTickLedgerResult _cfg _slot ldgrSt =
 >     LedgerResult { lrEvents = []
 >                  , lrResult = TickedLedgerStateC ldgrSt
@@ -625,7 +625,7 @@ the `ApplyBlock` typeclass:
 >     pure $ LedgerResult { lrEvents = []
 >                         , lrResult = block `applyBlockTo` tickedLdgrSt
 >                         }
-
+>
 >   reapplyBlockLedgerResult _ldgrCfg block tickedLdgrSt =
 >     LedgerResult { lrEvents = []
 >                  , lrResult = block `applyBlockTo` tickedLdgrSt