[RL] Fix typo and add wandb log

[gongel]

Before submitting

• Lint code. If there are lint issues, please format the code first.

# Install and register `pre-commit` in the project folder
pip install pre-commit && pre-commit install

# Process previous code files separately
pre-commit run --file XXXX.py

• Add test cases into tests folder. If there are codecov issues, please add tests cases first.

PR types

Docs

PR changes

Docs

Description

• Fix typo
• Update RL README and default config

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 46.91%. Comparing base (dbf9c44) to head (01882c5).
Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/rl/trainer/ppo_trainer.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #10641   +/-   ##
========================================
  Coverage    46.91%   46.91%           
========================================
  Files          799      799           
  Lines       132460   132460           
========================================
  Hits         62140    62140           
  Misses       70320    70320           

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