Docs: Places to improve xml docs

[tesar-tech]

From https://github.com/Megabit/Blazorise/pull/5846

• [ ] Chart: Many XML comments are missing. (especially on methods)
• [ ] Validation: The Validate method uses <inheritdoc>, but there is no valid source to inherit from. This is not the only instance of invalid <inheritdoc> usage.
• [ ] Bar is missing few "subcompnents", like BarDropdown