Update sequenceDiagram.md

[jbriales]

Add missing example with rgba color in box statement.

Currently it's hard to tell from doc if RGBA is supported here unless you try it.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 5.01%. Comparing base (115cb07) to head (6209165).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5802   +/-   ##
=======================================
  Coverage     5.01%   5.01%           
=======================================
  Files          337     337           
  Lines        48072   48072           
  Branches       550     550           
=======================================
  Hits          2413    2413           
  Misses       45659   45659           

Flag	Coverage Δ
unit	5.01% <ø> (ø)

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	1 changed	Oct 3, 2024, 4:25 AM

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pnpm add https://pkg.pr.new/mermaid-js/mermaid@5802

pnpm add https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/layout-elk@5802

pnpm add https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/mermaid-zenuml@5802

pnpm add https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/parser@5802

commit: b503c2c

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