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Title: Improve Documentation for Dynamic Slot Names by Adding Declaration Examples

Description:

This pull request enhances the Dynamic Slot Names section of the Vue.js documentation by providing explanations and examples on how to declare dynamic slots in child components, not just how to use them in parent components.

Description of Problem

The current documentation for Dynamic Slot Names focuses primarily on how to use dynamic slot names in the parent component using v-slot with dynamic arguments. It lacks information on how to declare dynamic slots in the child component. This omission can lead to confusion, as understanding both declaration and usage is essential for implementing dynamic slots effectively.

Proposed Solution

• Added Explanation: Introduced a subsection that explains how to declare dynamic slots in child components using the :name binding on the <slot> element.
• Examples with Composition API: Provided examples using <script setup> and the Composition API to align with modern Vue.js practices.
• Static and Dynamic Usage: Illustrated both static and dynamic ways of providing slot content in parent components.
• Practical Example: Included a practical example that mirrors common use cases, making it easier for developers to understand and implement dynamic slots.
• Important Notes: Highlighted crucial points such as matching slot names between parent and child components and handling fallback content.

Additional Information

• Consistency: Ensured that the new content follows the existing documentation style and guidelines.
• Clarity: Kept explanations concise to maintain readability while providing enough detail for comprehension.
• Reusability: The examples can be easily adapted by developers for their own projects.