feat(radio): update radio xplat topic

[IMinchev64]

Closes #713

React samples: IgniteUI/igniteui-react-examples#1120
WC samples: IgniteUI/igniteui-wc-examples#1296
Blazor samples: IgniteUI/igniteui-blazor-examples#1324
Angular samples: IgniteUI/igniteui-angular-samples#4052

Checklist:

• check topic's TOC/menu and paragraph headings
• Include TOC topic labels in the topic content when it has a valuable update, is new, or is considered preview / beta
• link to other topics using ./page.mdx or ../relative/path.mdx (.mdx extension required)
• at the References section at the end of the topic add links to topics, samples, etc
• reference API documentation instead of adding a section with API

• use valid component names - [Data] Grid, IgxSelectComponent, <igx-combo>
• use spell checker tool (VS Code, Grammarly, Microsoft Editor)
• add inline code blocks for the names of classes / tags / properties
• add language descriptor for the code blocks
• check if links function by running the check-api/mdx npm commands
• check if sample is working and fully visible in the topic
• check if sample is working and fully visible in the StackBlitz
• check if code blocks match the code in StackBlitz demo
• add or update meaningful llms.description metadata and run npm run check:llms-metadata

• follow SEO guidelines to fill topic's metadata (SEO guidelines)

• do not resolve requested changes (leave that to the reviewer)

[DiLazarova]

Review and Test for Radio Group in React

1. Live Demo - Please change the Background Color for all Examples in Dark Mode as follows:

• BG color - Special surface dark - #222222 - Material
• BG color - Special surface dark - #1B1B1B - Fluent
• BG color - Special surface dark - #212529 - Bootstrap
• BG color - Special surface dark - #1E1F24 - Indigo

Please remove the " * " Symbol from the Title

2. Layout - The two examples should be in horizontal center position with equal space from top and bottom

Please change the Background Color for all Examples in Dark Mode as follows:

• BG color - Special surface dark - #222222 - Material
• BG color - Special surface dark - #1B1B1B - Fluent
• BG color - Special surface dark - #212529 - Bootstrap
• BG color - Special surface dark - #1E1F24 - Indigo

3. Interaction States

Please double check all component states in this example for all 4 themes - light and dark

Fluent

4. Disabled States and On/Off States Sections

Please change the Background Color for all Examples in Dark Mode as follows:

• BG color - Special surface dark - #222222 - Material
• BG color - Special surface dark - #1B1B1B - Fluent
• BG color - Special surface dark - #212529 - Bootstrap
• BG color - Special surface dark - #1E1F24 - Indigo