fix: doc modal hidden by config modal

[iamjoel]

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[CodingOnStar]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.88%. Comparing base (fbedb60) to head (6e2591a).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #35157   +/-   ##
=======================================
  Coverage   84.88%   84.88%           
=======================================
  Files        4362     4362           
  Lines      196074   196074           
  Branches    37261    37261           
=======================================
  Hits       166440   166440           
  Misses      26583    26583           
  Partials     3051     3051           

Flag	Coverage Δ
web	85.77% <100.00%> (ø)

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