docs(form): add async pattern validation

[philibea]

Summary

Type

• Bug
• Feature
• Enhancement
• Documentation
• Migration
• Refactor

Summarise concisely:

What is expected?

(Description of the new behavior)

The following changes where made:

(Describe what you did)

Relevant logs and/or screenshots

Page	Before	After
url	screenshot	screenshot
url	screenshot	screenshot

[changeset-bot]

⚠️ No Changeset found

Latest commit: e4d3c21

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.78%. Comparing base (21df8c6) to head (e4d3c21).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5408      +/-   ##
==========================================
- Coverage   87.57%   81.78%   -5.80%     
==========================================
  Files         227       33     -194     
  Lines        7979      549    -7430     
  Branches     3551      170    -3381     
==========================================
- Hits         6988      449    -6539     
+ Misses        991      100     -891     

see 194 files with indirect coverage changes

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