Replace version number placeholder

[BaumiCoder]

The header of the section contains the version number for the feature, so the warning box should contain the same version

📑 Summary

In own section of the documentation the MERMAID_RELEASE_VERSION was used literally at one place. May it was an misunderstand or a slip in 4efac67.

📏 Design Decisions

The MERMAID_RELEASE_VERSION is not suitable here. If I understand correctly a <MERMAID_RELEASE_VERSION> in the markdown would be replaced with the current version of mermaid (e.g., in the Contributing page), but a specific feature is introduced in a specific version. So a dynamic version number is not suitable here.

📋 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

[netlify]

❌ Deploy Preview for mermaid-js failed.

Name	Link
🔨 Latest commit	81491f2
🔍 Latest deploy log	https://app.netlify.com/sites/mermaid-js/deploys/65d4f07c31c0580008715be7

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (70c8a3d) 43.20% compared to head (81491f2) 79.15%.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #5304       +/-   ##
============================================
+ Coverage    43.20%   79.15%   +35.94%     
============================================
  Files           23      175      +152     
  Lines         5115    14514     +9399     
  Branches        23      866      +843     
============================================
+ Hits          2210    11488     +9278     
+ Misses        2904     2823       -81     
- Partials         1      203      +202     

Flag	Coverage Δ
e2e	84.72% <ø> (?)
unit	43.20% <ø> (ø)

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see 170 files with indirect coverage changes