docs: 优化 contextmenu API 文档 close #2882

[lijinke666]

👀 PR includes

🔧 Chore

• Test case
• Docs / demos update
• CI / workflow
• Release version
• Other ()

📝 Description

🖼️ Screenshot

Before	After
❌	✅

🔗 Related issue link

close #2882

🔍 Self-Check before the merge

• Add or update relevant docs.
• Add or update relevant demos.
• Add or update test case.
• Add or update relevant TypeScript definitions.

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Name	Status	Preview	Comments	Updated (UTC)
antvis-s2	❌ Failed (Inspect)			Sep 2, 2024 2:58am

[github-actions]

Size Change: 0 B

Total Size: 329 kB

ℹ️ View Unchanged

Filename	Size
./packages/s2-core/dist/index.min.js	229 kB
./packages/s2-core/dist/style.min.css	388 B
./packages/s2-react/dist/index.min.js	70.9 kB
./packages/s2-react/dist/style.min.css	3.88 kB
./packages/s2-vue/dist/index.min.js	22.9 kB
./packages/s2-vue/dist/style.min.css	1.97 kB

_{compressed-size-action}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.81%. Comparing base (ecdc9c8) to head (329e507).
Report is 431 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2886      +/-   ##
==========================================
+ Coverage   75.77%   80.81%   +5.03%     
==========================================
  Files         257      180      -77     
  Lines       11994    10412    -1582     
  Branches     2464     2360     -104     
==========================================
- Hits         9088     8414     -674     
+ Misses       1398      553     -845     
+ Partials     1508     1445      -63     

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