Improve the document

[wanghan-iapcm]

• provide cross links when it is applicable
• fix bugs
• remove duplicated contents

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (66a5acc) 88.12% compared to head (9b4228f) 88.13%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
+ Coverage   88.12%   88.13%   +0.01%     
==========================================
  Files          80       81       +1     
  Lines        4032     4096      +64     
==========================================
+ Hits         3553     3610      +57     
- Misses        479      486       +7     

Files	Coverage Δ
dpgen2/conf/alloy_conf.py	87.50% <100.00%> (+0.70%)	⬆️
dpgen2/conf/file_conf.py	96.07% <100.00%> (+0.24%)	⬆️
dpgen2/entrypoint/args.py	91.53% <100.00%> (+0.26%)	⬆️
dpgen2/exploration/report/report_adaptive_lower.py	96.27% <100.00%> (+0.29%)	⬆️
...gen2/exploration/report/report_trust_levels_max.py	97.50% <100.00%> (+0.94%)	⬆️
...2/exploration/report/report_trust_levels_random.py	100.00% <100.00%> (ø)
...n2/exploration/task/make_task_group_from_config.py	97.59% <100.00%> (ø)

... and 3 files with indirect coverage changes

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