cluster: unify default tiflash logger size/count with doc

[fzzf678]

What problem does this PR solve?

In the doc https://docs.pingcap.com/tidb/stable/tiflash-configuration/#logger, the logger.size and logger.count should be 100M and 10, this is not consistent with the default value in the tiup cluster.

close #2684

What is changed and how it works?

Unify the logger size and count with doc

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.35%. Comparing base (c567110) to head (d97c3c5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2683      +/-   ##
==========================================
- Coverage   42.37%   42.35%   -0.01%     
==========================================
  Files         424      424              
  Lines       47043    47043              
==========================================
- Hits        19930    19925       -5     
- Misses      24426    24429       +3     
- Partials     2687     2689       +2     

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