Update stepped process documentation

[MewenLeHo]

Related issues

Closes #1868

Description

I added a callout message to inform our users about the $stepped-process-max-items variable.

Motivation & Context

Have a better documentation for the stepped process component.

Types of change

• Refactoring (non-breaking change)

Live previews

• https://deploy-preview-1908--boosted.netlify.app/docs/5.3/components/stepped-process/

Checklist

Contribution

• I have read the contributing guidelines

Accessibility

• (NA) My change follows accessibility good practices; I have at least run axe

Design

• (NA) My change respects the design guidelines defined in Orange Design System
• (NA) My change is compatible with responsive display

Development

• My change follows the developer guide
• (NA) I have added JavaScript unit tests to cover my changes
• (NA) I have added SCSS unit tests to cover my changes

Documentation

• My change introduces changes to the documentation and/or I have updated the documentation accordingly

Checklist (for Core Team only)

• My change introduces changes to the migration guide
• (NA) My new component is added in Storybook
• (NA) My new component is compatible with RTL
• (NA) Manually run BrowserStack tests
• (NA) Manually test browser compatibility with BrowserStack (Chrome >= 60, Firefox >= 60 (+ ESR), Edge, Safari >= 12, iOS Safari, Chrome & Firefox on Android)
• Code review
• (NA) Design review
• (NA) A11y review

After the merge

• Manually launch Percy tests

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[MewenLeHo]

Questions waiting for your opinions:

• Should this information be in a callout or not?
• Should we rename the $stepped-process-max-items variable because it's not really a limitation as explained in the related issue. More like a $stepped-process-number-of-items variable. But it will be a breaking change and I am not sure if it's really needed or not? 🤔

[louismaximepiton]

Should this information be in a callout or not?

I don't have a strong idea on this, feeling that it might be a bit better to let it inside a callout since it's new.

Should we rename the $stepped-process-max-items variable because it's not really a limitation as explained in the related issue. More like a $stepped-process-number-of-items variable. But it will be a breaking change and I am not sure if it's really needed or not? 🤔

I'd say keep it as-is since it might represents the maximum number of steps displayed in the website imo + keeping it like that might not break things, so I's agree to let it as-is.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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