docs: fix some language issues and deprecated link (#3733)

docs/.vuepress/config.js

@@ -44,7 +44,7 @@ module.exports = {
           "/app-dev/app-development",
           "/app-dev/subscribing-to-events-via-websocket",
           "/app-dev/indexing-transactions",
-          "/app-dev/abci-spec",
+          "/spec/abci/abci",
           "/app-dev/ecosystem"
         ]
       },

docs/app-dev/app-development.md

@@ -133,8 +133,8 @@ the mempool. If Tendermint is just started or the clients sent more than
 100k transactions, old transactions may be sent to the application. So
 it is important CheckTx implements some logic to handle them.
 
-There are cases where a transaction will (or may) become valid in some
-future state, in which case you probably want to disable Tendermint's
+If there are cases in your application where a transaction may become invalid in some
+future state, you probably want to disable Tendermint's
 cache. You can do that by setting `[mempool] cache_size = 0` in the
 config.
 
@@ -205,7 +205,7 @@ Once all processing of the block is complete, Tendermint sends the
 Commit request and blocks waiting for a response. While the mempool may
 run concurrently with block processing (the BeginBlock, DeliverTxs, and
 EndBlock), it is locked for the Commit request so that its state can be
-safely reset during Commit. This means the app _MUST NOT_ do any
+safely updated during Commit. This means the app _MUST NOT_ do any
 blocking communication with the mempool (ie. broadcast_tx) during
 Commit, or there will be deadlock. Note also that all remaining
 transactions in the mempool are replayed on the mempool connection

docs/spec/abci/abci.md

@@ -141,7 +141,7 @@ on them. All other fields in the `Response*` must be strictly deterministic.
 ## Block Execution
 
 The first time a new blockchain is started, Tendermint calls
-`InitChain`. From then on, the follow sequence of methods is executed for each
+`InitChain`. From then on, the following sequence of methods is executed for each
 block:
 
 `BeginBlock, [DeliverTx], EndBlock, Commit`

docs/spec/blockchain/encoding.md

@@ -218,7 +218,7 @@ func MerkleRoot(items [][]byte) []byte{
 	case 0:
 		return nil
 	case 1:
-		return leafHash(leafs[0])
+		return leafHash(items[0])
 	default:
 		k := getSplitPoint(len(items))
 		left := MerkleRoot(items[:k])

docs/spec/blockchain/state.md

@@ -59,7 +59,7 @@ type Validator struct {
 When hashing the Validator struct, the address is not included,
 because it is redundant with the pubkey.
 
-The `state.Validators`, `state.LastValidators`, and `state.NextValidators`, must always by sorted by validator address,
+The `state.Validators`, `state.LastValidators`, and `state.NextValidators`, must always be sorted by validator address,
 so that there is a canonical order for computing the MerkleRoot.
 
 We also define a `TotalVotingPower` function, to return the total voting power:

docs/tendermint-core/using-tendermint.md

@@ -202,8 +202,10 @@ Note that raw hex cannot be used in `POST` transactions.
 
 ## Reset
 
-**WARNING: UNSAFE** Only do this in development and only if you can
+::: warning
+**UNSAFE** Only do this in development and only if you can
 afford to lose all blockchain data!
+:::
 
 To reset a blockchain, stop the node and run: