[86by7eg12] Fix Tooltip and Informer a11y docs

[sheila-semrush]

Motivation and Context

1. Optimized the a11y tab structure and added missing info.
2. Fixed examples to show correct usage for best a11y, removed unnecessary examples.
3. Fixed Informer docs to refer to DescriptionTooltip instead of Hint, updated behaviour description.
4. Edited Tooltip Design tab for better comprehension, clarified differences in behaviour and usage and fixed incorrect info.

Concerns:

1. We recommend merging interactive elements with the Trigger component, but it doesn't work with Button. So the examples currently don't comply with our own recommendations. Will need to look into it together with devs.

How has this been tested?

Manually.

Screenshots (if appropriate):

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).
• [x] Nice improve.

Checklist:

• [x] My code follows the code style of this project.
• [x] 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.