Added aria-label to character counter examples

[jcfilben]

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What does this PR do?

Adds aria-label to the character counter example so screenreader users are aware of the character limit before they start typing

Where should the reviewer start?

What testing has been done on this PR?

In addition to the feature you are implementing, have you checked the following:

General UX Checks

• Small, medium, and large screen sizes
• Cross-browsers (FireFox, Chrome, and Safari)
• Light & dark modes
• All hyperlinks route properly

Accessibility Checks

• Keyboard interactions
• Screen reader experience
• Run WAVE accessibility plugin (Chrome)

Code Quality Checks

• Console is free of warnings and errors
• Passes E2E commit checks
• Visual snapshots are reasonable

How should this be manually tested?

Any background context you want to provide?

What are the relevant issues?

#3787

Screenshots (if appropriate)

Should this PR be mentioned in Design System updates?

no

Is this change backwards compatible or is it a breaking change?

backwards compatible

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Latest commit: aa15fa2

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