[86byh36gp][docs] fixed input examples a11y

[msereniti]

Motivation and Context

This PR includes important fixes in Input examples a11y. No changes were made in the component itself.

How has this been tested?

Manually.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Nice improve.

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly or it's not required.
• Unit tests are not broken.
• I have added changelog note to corresponding CHANGELOG.md file with planned publish date.
• I have added new unit tests on added of fixed functionality.

[j-mnizhek]

Looks good 😎 I've only updated text for Hint and aria-label for Show password button.