docs: update usage docs

[tomdavies73]

Proposed behaviour

Updates the usage docs to remove any mentions of prop types and offer direct guidance regarding component imports.

Current behaviour

N/A

Checklist

• Commits follow our style guide
• Related issues linked in commit messages if required
• Screenshots are included in the PR if useful
• All themes are supported if required
• Unit tests added or updated if required
• Playwright automation tests added or updated if required
• Storybook added or updated if required
• Translations added or updated (including creating or amending translation keys table in storybook) if required
• Typescript d.ts file added or updated if required
• Related docs have been updated if required

QA

• Tested in provided StackBlitz sandbox/Storybook
• Add new Playwright test coverage if required
• Carbon implementation matches Design System/designs
• UI Tests GitHub check reviewed if required

Additional context

Testing instructions

[edleeks87]

Thanks for raising this @tomdavies73 definitely fills a gap in our docs

[DipperTheDan]

Nothing more to add from me. Just address all the points made by @edleeks87.