[skip ci] Check the syntax of meta_snapshot docs (#13307)

Signed-off-by: min.tian <min.tian.cn@gmail.com>
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@ -67,7 +67,7 @@ The output of above test program should look like this:
--- PASS: TestMVCC (0.01s)
```
In `etcd`, each write operation would add `1` to `Revision`. So if we specify the `Revision` value at query, we can get the historical value under that `Revision`.
In `etcd`, each writes operation would add `1` to `Revision`. So if we specify the `Revision` value at query, we can get the historical value under that `Revision`.
`metaSnapShot` is based on this feature of `etcd`. We will write an extra `Timestamp` on each write operation. `etcd`'s `Txn` makes sure that the `Timestamp` would have the same `Revision` with user data.