[llm] Add llm pretrain tutorial

[hanlintang]

PR types

Others

PR changes

Docs

Description

新手大模型预训练指南文档，同步在aistudio公开了项目
Add：
llm/docs/pretrain_tutorial.md
docs/zh/llm/docs/pretrain_tutorial.md
另外有一个文件的软连接，pre-commit自动加入进来的。
docs/zh/llm/devices/intel_hpu/tests/README.md

Issue: #9763
对应任务1

@DrownFish19

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.95%. Comparing base (ddcb722) to head (961b3d0).

❌ Your project check has failed because the head coverage (46.95%) is below the target coverage (58.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #10611   +/-   ##
========================================
  Coverage    46.94%   46.95%           
========================================
  Files          799      799           
  Lines       132348   132348           
========================================
+ Hits         62137    62138    +1     
+ Misses       70211    70210    -1     

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