Fix tiered store README.md error about Configuration

[golden-yang]

Which Issue(s) This PR Fixes

ISSUE #5923 add README.md file to explain how to use tiered storage.

There was a simple configuration error

[golden-yang]

@ShadowySpirits Hi, I am trying to use tiered store. Thanks for your work.

PTAL

[ShadowySpirits]

@ShadowySpirits Hi, I am trying to use tiered store. Thanks for your work.

PTAL

I prefer filepath. Actually, the difference between filePath and filepath is discussed in an early issue: #6483 (comment).

[golden-yang]

@ShadowySpirits Hi, I am trying to use tiered store. Thanks for your work.
PTAL

I prefer filepath. Actually, the difference between filePath and filepath is discussed in an early issue: #6483 (comment).

I can accept both filepath and filePath . Now code and documentation are incompatible. I found change tiered store path failed in broker.conf when it isn't consistent.
Which one should we change? @ShadowySpirits

org.apache.rocketmq.tieredstore.common.TieredMessageStoreConfig#tieredStoreFilePath

[ShadowySpirits]

@golden-yang I suggest to modify the code.

[golden-yang]

@golden-yang I suggest to modify the code.

I change tieredStoreFilePath to tieredStoreFilepath. @ShadowySpirits

PTAL

[ShadowySpirits]

@zhouxinyu Please approve the workflows.

[joeCarf]

LGTM

[codecov-commenter]

Codecov Report

Merging #7436 (371b765) into develop (0f01df4) will increase coverage by 0.08%.
Report is 15 commits behind head on develop.
The diff coverage is 39.39%.

@@              Coverage Diff              @@
##             develop    #7436      +/-   ##
=============================================
+ Coverage      42.97%   43.06%   +0.08%     
- Complexity      9665     9686      +21     
=============================================
  Files           1161     1161              
  Lines          83920    83926       +6     
  Branches       10898    10899       +1     
=============================================
+ Hits           36064    36139      +75     
+ Misses         43379    43314      -65     
+ Partials        4477     4473       -4     

Files	Coverage Δ
...q/tieredstore/common/TieredMessageStoreConfig.java	68.91% <100.00%> (ø)
...q/tieredstore/provider/posix/PosixFileSegment.java	67.56% <100.00%> (ø)
...he/rocketmq/broker/processor/PopReviveService.java	36.38% <25.00%> (ø)
...e/rocketmq/remoting/netty/NettyRemotingClient.java	40.29% <31.25%> (-0.24%)	⬇️

... and 28 files with indirect coverage changes

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[lizhimins]

[lizhimins]

There is a widely use of filePath in the rocketmq project. The rename operation which not only brings compatibility issues but also conflicts with the naming style of the rocketmq project. It is recommended to revert this change.