docs: fix spelling issues (#183)

* Update mixin-kernel-node-operations.md

* Update mixin-kernel-snapshots.md

* Update mixin-kernel-transactions.md

doc/mixin-kernel-node-operations.md

@@ -96,7 +96,7 @@ When a new Kernel Year starts or a resign transaction gets snapshot, the Kernel
 
 - **inputs**: the single accept transaction output as the only input.
 
-- **outputs**: one single output with type `0xa6`, the exact accept transaction amount, script `0xfffe01`, keys and mask should be derived from the payee.
+- **outputs**: one single output with type `0xa6`, the exact accepted transaction amount, script `0xfffe01`, keys and mask should be derived from the payee.
 
 - **extra**: 64 bytes same as the accept transaction extra.
 

doc/mixin-kernel-snapshots.md

@@ -4,7 +4,7 @@ Snapshot is the core of all Mixin Kernel stuffs, the Mixin Kernel BFT consensus
 
 The current Kernel snapshot version is `0x01`, which is marshaled as a special msgpack format [https://github.com/MixinNetwork/msgpack](https://github.com/MixinNetwork/msgpack) before the snapshot hash calculation.
 
-All snapshot related API exposed externally have and should always have a consistent JSON representation as below.
+All snapshot-related API exposed externally have and should always have a consistent JSON representation as below.
 
 ```json
 {
@@ -32,7 +32,7 @@ All snapshot related API exposed externally have and should always have a consis
 
 - **timestamp**: a uint64 nanosecond since Unix epoch, which is provided by the leading node and agreed upon consensus.
 
-- **topology**: a uint64 number as the snapshot order in all snapshots, this value is the only node provided value, **NOT** included in the hash and not agreed by consensus.
+- **topology**: a uint64 number as the snapshot order in all snapshots, this value is the only node-provided value, **NOT** included in the hash and not agreed by consensus.
 
 - **transaction**: HEX representation of a 32 bytes hash, which is the transaction hash included by this snapshot.
 

doc/mixin-kernel-transactions.md

@@ -2,7 +2,7 @@
 
 The current Kernel transaction version is `0x01`, which is marshaled as a special msgpack format [https://github.com/MixinNetwork/msgpack](https://github.com/MixinNetwork/msgpack) before the transaction hash calculation.
 
-All transaction related API exposed externally have and should always have a consistent JSON representation of inputs and outputs, a neat UTXO model.
+All transaction-related API exposed externally have and should always have a consistent JSON representation of inputs and outputs, a neat UTXO model.
 
 ```json
 {
@@ -51,7 +51,7 @@ All transaction related API exposed externally have and should always have a con
 
 - **version**: a uint8 number to hint the current transaction format.
 
-The genesis input is only used when the network boot from genesis.json, only those genesis Kernel Nodes accept transactions have this kind of inputs.
+The genesis input is only used when the network boot from genesis.json, only those genesis Kernel Nodes that accept transactions have this kind of inputs.
 
 ```json
 {
@@ -104,4 +104,4 @@ The output target is always masked and can be spent according to the type and sc
 
 - **script**: HEX representation of `{0xff, 0xfe, T}`, while `0 <= T <= 0x40`, where T is the required number of signatures from keys to spend this output.
 
-- **type**: a uint8 number to constraint when and how this output can be spent as an input, usually 0 which means it can be spent once the script fulfilled.
+- **type**: a uint8 number to constraint when and how this output can be spent as an input, usually 0 which means it can be spent once the script is fulfilled.