blockchain: remove duplicate evidence sections (#124)

spec/core/data_structures.md

@@ -522,17 +522,6 @@ func (vote *Vote) Verify(chainID string, pubKey crypto.PubKey) error {
 where `pubKey.Verify` performs the appropriate digital signature verification of the `pubKey`
 against the given signature and message bytes.
 
-## Evidence
-
-There is currently only one kind of evidence, `DuplicateVoteEvidence`.
-
-DuplicateVoteEvidence `ev` is valid if
-
-- `ev.VoteA` and `ev.VoteB` can be verified with `ev.PubKey`
-- `ev.VoteA` and `ev.VoteB` have the same `Height, Round, Address, Index, Type`
-- `ev.VoteA.BlockID != ev.VoteB.BlockID`
-- `(block.Height - ev.VoteA.Height) < MAX_EVIDENCE_AGE`
-
 # Execution
 
 Once a block is validated, it can be executed against the state.

spec/reactors/consensus/consensus.md

@@ -16,7 +16,7 @@ explained in a forthcoming document.
 For efficiency reasons, validators in Tendermint consensus protocol do not agree directly on the
 block as the block size is big, i.e., they don't embed the block inside `Proposal` and
 `VoteMessage`. Instead, they reach agreement on the `BlockID` (see `BlockID` definition in
-[Blockchain](https://github.com/tendermint/spec/blob/master/spec/blockchain/blockchain.md#blockid) section) 
+[Blockchain](https://github.com/tendermint/spec/blob/master/spec/core/data_structures.md#blockid) section) 
 that uniquely identifies each block. The block itself is
 disseminated to validator processes using peer-to-peer gossiping protocol. It starts by having a
 proposer first splitting a block into a number of block parts, that are then gossiped between
@@ -67,7 +67,7 @@ type Proposal struct {
 
 VoteMessage is sent to vote for some block (or to inform others that a process does not vote in the
 current round). Vote is defined in the 
-[Blockchain](https://github.com/tendermint/spec/blob/master/spec/blockchain/blockchain.md#blockidd) 
+[Blockchain](https://github.com/tendermint/spec/blob/master/spec/core/data_structures.md#blockidd) 
 section and contains validator's
 information (validator address and index), height and round for which the vote is sent, vote type,
 blockID if process vote for some block (`nil` otherwise) and a timestamp when the vote is sent. The
@@ -81,7 +81,7 @@ type VoteMessage struct {
 
 ## BlockPartMessage
 
-BlockPartMessage is sent when gossipping a piece of the proposed block. It contains height, round
+BlockPartMessage is sent when gossiping a piece of the proposed block. It contains height, round
 and the block part.
 
 ```go