Update flowchart.md with explicit line break example

[Actpohomoc]

📑 Summary

This pull request updates the flowchart.md documentation to clarify how to insert line breaks within text in flowchart nodes. Previously, the example showed multiple lines without explicitly demonstrating the mechanism for line breaks, which could be confusing for users.

The change replaces the ambiguous example:

flowchart TD
    newLines["`Line1
    Line 2
    Line 3`"]

with an explicit example using <br/> for a line break:

flowchart TD
    newLines["`Line1
    Line 2<br/>Line 3`"]

This simple addition directly addresses a common user difficulty in finding information about line breaks within flowchart text.

📏 Design Decisions

The primary design decision was to provide a clear and immediate answer to how line breaks are handled within flowchart text. Using <br/> is the standard HTML line break tag and is widely understood, making it the most intuitive solution for documentation. By directly showing this in the example, users can quickly grasp the concept without needing to search for additional notes or documentation sections.

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• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
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commit: 2223d80

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 3.82%. Comparing base (d9396ee) to head (2223d80).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6703   +/-   ##
=======================================
  Coverage     3.82%   3.82%           
=======================================
  Files          431     431           
  Lines        44487   44487           
  Branches       683     683           
=======================================
  Hits          1701    1701           
  Misses       42786   42786           

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Jun 29, 2025, 10:21 AM