DOCS: update Flowchart page

[huynhicode]

📑 Summary

This PR contains updates to the Flowchart page.

Resolves #

Updates documentation re issue 2492

📏 Design Decisions

n/a

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🔖 targeted develop branch

screenshot

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6028036) 79.38% compared to head (5cec92c) 76.22%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5169      +/-   ##
===========================================
- Coverage    79.38%   76.22%   -3.17%     
===========================================
  Files          166      166              
  Lines        13886    13886              
  Branches       707      707              
===========================================
- Hits         11024    10585     -439     
- Misses        2708     3138     +430     
- Partials       154      163       +9     

Flag	Coverage Δ
e2e	81.26% <ø> (-3.94%)	⬇️
unit	43.04% <ø> (ø)

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see 21 files with indirect coverage changes