fix: classDiagram relation direction, and add docs

[hikerpig]

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Name	Status	Preview	Updated (UTC)
pintorajs	✅ Ready (Inspect)	Visit Preview	Jan 6, 2024 4:08pm

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (87f80b1) 91.06% compared to head (9bdb57e) 91.93%.
Report is 113 commits behind head on master.

Files	Patch %	Lines
packages/pintora-diagrams/src/class/db.ts	92.98%	8 Missing ⚠️
packages/pintora-diagrams/src/dot/artist.ts	92.20%	6 Missing ⚠️
packages/pintora-diagrams/src/activity/artist.ts	92.30%	3 Missing ⚠️
packages/pintora-diagrams/src/class/artist.ts	98.53%	3 Missing ⚠️
packages/pintora-diagrams/src/class/config.ts	90.47%	2 Missing ⚠️
packages/pintora-diagrams/src/util/graph.ts	33.33%	2 Missing ⚠️
packages/pintora-diagrams/src/sequence/artist.ts	95.45%	1 Missing ⚠️
...kages/pintora-diagrams/src/sequence/artist/loop.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
+ Coverage   91.06%   91.93%   +0.86%     
==========================================
  Files          69       88      +19     
  Lines        3994     5056    +1062     
  Branches      762      893     +131     
==========================================
+ Hits         3637     4648    +1011     
- Misses        357      408      +51     

Flag	Coverage Δ
unittests	91.93% <96.73%> (+0.86%)	⬆️

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