fix case that generate broken link on docs

[lchenay]

📑 Summary

Documentation url are case sensitive. This Typo generate broken link on all the documentation page when you want to go to XYchart.

📋 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

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[codecov]

Codecov Report

Merging #5006 (379722d) into develop (f5bd1e0) will increase coverage by 36.45%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #5006       +/-   ##
============================================
+ Coverage    42.94%   79.39%   +36.45%     
============================================
  Files           23      164      +141     
  Lines         4972    13820     +8848     
  Branches        21      693      +672     
============================================
+ Hits          2135    10973     +8838     
+ Misses        2836     2698      -138     
- Partials         1      149      +148     

Flag	Coverage Δ
e2e	85.26% <ø> (?)
unit	42.94% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 160 files with indirect coverage changes

[aloisklink]

It looks like PR #5014 has already fixed this issue. Sorry about that, your PR was made first, so we should have reviewed and merged it first.

But, it looks like since your changes are exactly the same as that PR, so we might be able to merge this PR too, so you also get a contribution credit for fixing a bug!

[mermaid-bot]

@lchenay, Thank you for the contribution!
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[lchenay]

We don't do PR to be first.
We do it to improve a project.
You can close it if it's fixed by another one ; fixing situation is the main purpose.