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fix typo in doc/project2-RaftKV.md (#335)

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* fix typo
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doc/project2-RaftKV.md
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@ -225,6 +225,6 @@ Raftstore checks whether it needs to gc log from time to time based on the confi
Then due to the log compaction, Raft module maybe needs to send a snapshot. `PeerStorage` implements `Storage.Snapshot()`. TinyKV generates snapshots and applies snapshots in the region worker. When calling `Snapshot()`, it actually sends a task `RegionTaskGen` to the region worker. The message handler of the region worker is located in `kv/raftstore/runner/region_task.go`. It scans the underlying engines to generate a snapshot, and sends snapshot metadata by channel. At the next time Raft calling `Snapshot`, it checks whether the snapshot generating is finished. If yes, Raft should send the snapshot message to other peers, and the snapshot sending and receiving work is handled by `kv/storage/raft_storage/snap_runner.go`. You don’t need to dive into the details, only should know the snapshot message will be handled by `onRaftMsg` after the snapshot is received.
Then the snapshot will reflect in the next Raft ready, so the task you should do is to modify the raft ready process to handle the case of a snapshot. When you are sure to apply the snapshot, you can update the peer storage’s memory state like `RaftLocalState`, `RaftApplyState`, and `RegionLocalState`. Also, don’t forget to persist these states to kvdb and raftdb and remove stale state from kvdb and raftdb. Besides, you also need to update
`PeerStorage.snapState` to `snap.SnapState_Applying` and send `runner.RegionTaskApply` task to region worker through `PeerStorage.regionSched` and wait until region worker finish.
`PeerStorage.snapState` to `snap.SnapState_Applying` and send `runner.RegionTaskApply` task to region worker through `PeerStorage.regionSched` and wait until region worker finishes.
You should run `make project2c` to pass all the tests.