[#283] Add code example to show how to use token in tokens pages of demo app

[Tayebsed93]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

#283

Description

Add in view sections with code sample to explain to user show they can use the tokens

Motivation & Context

Make users able to learn how they can use the tokens, exactly like with ODS demo app

Types of change

• New feature (non-breaking change which adds functionality)

Previews

Checklist

Contribution

• I have read the contributing guidelines

Accessibility

• My change follows accessibility good practices

Design

• My change respects the design guidelines of Orange Unified Design System

Development

• My change follows the developer guide
• I checked my changes do not add new SwiftLint warnings
• I have added unit tests to cover my changes (optional)

Documentation

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

Checklist (for Core Team only)

• The evolution have been tested and the project builds for iPhones and iPads
• Code review has been done by reviewers according to CODEOWNERS file
• Design review has been done
• Accessibiltiy review has been done
• Q/A team has tested the evolution
• Documentation has been updated if relevant
• Internal files have been updated if relevant (like CONTRIBUTING, DEVELOP, THIRD_PARTY, CONTRIBUTORS, NOTICE)
• CHANGELOG has been updated respecting keep a changelog rules and reference the issues
• The wiki has been updated if needed (optional)

[ludovic35]

@pylapp Need to review last commit

[pylapp]

LGTM (after some fixes / refactoring from my side)