### What changes were proposed in this pull request?
Fix some typos and grammar
### Why are the changes needed?
Ditto
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
manually test
Closes#1733 from onebox-li/fix-typo.
Authored-by: onebox-li <lyh-36@163.com>
Signed-off-by: zky.zhoukeyong <zky.zhoukeyong@alibaba-inc.com>
### What changes were proposed in this pull request?
It was discussed during the last meeting, but abandoned due to the complication.
### Why are the changes needed?
Make the configuration unified.
### Does this PR introduce _any_ user-facing change?
Yes, but the legacy configurations still take effect.
### How was this patch tested?
New UTs.
Closes#1549 from pan3793/CELEBORN-638.
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: zky.zhoukeyong <zky.zhoukeyong@alibaba-inc.com>
### What changes were proposed in this pull request?
Refine this doc since:
1. It didn't mention our cluster default RPC type is `NETTY`
2. If the user use the ratis shell with `GRPC` but didn't know the ratis cluster is `NETTY`, the error is not clear and hard to debug.
### Why are the changes needed?
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
Closes#1542 from AngersZhuuuu/CELEBORN-623-FOLLOWUP.
Lead-authored-by: Angerszhuuuu <angers.zhu@gmail.com>
Co-authored-by: Cheng Pan <pan3793@gmail.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>
### What changes were proposed in this pull request?
Ratis-shell use GRPC by default. Celeborn support Netty for ratis, if `raft.rpc.type` is not specified, commands may fail.
e.g.
```
org.apache.ratis.thirdparty.io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED: deadline exceeded after 14.947369960s. [closed=[], open=[[buffered_nanos=14962358255, waiting_for_connection]]]
```
So I think we should update the document to mention how to change the RPC type to in `celeborn-ratis`.
### Why are the changes needed?
Improve user experience
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Manually test
Closes#1530 from onebox-li/ratis-shell-default-rpc.
Lead-authored-by: liyihe <liyihe@bigo.sg>
Co-authored-by: Cheng Pan <pan3793@gmail.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>
