[Docs] Enhance XML comment examples in documentation

[Copilot]

This PR improves the documentation regarding XML comment examples in DocFX by:

1. Enhancing the existing example in basic-concepts.md to include more XML comment tags:

   • Added <exception>, <example>, <seealso>, <paramref>, and enhanced <remarks> with multiple paragraphs
   • Updated the code sample to demonstrate exception handling
   • Added <see> tags with both cref and href attributes

2. Creating a new dedicated page xml-comment-examples.md with comprehensive examples:

   • Organized examples into logical sections (Basic, Advanced, Formatting)
   • Included examples for all major XML comment tags supported by DocFX
   • Added complex examples demonstrating how multiple tags can be used together
   • Included references to Microsoft's documentation for further reading

3. Adding a reference from basic-concepts.md to the new examples page:

   • Added a paragraph explaining that more XML comment examples are available
   • Linked to the new examples page

4. Updated the table of contents to include the new examples page:

   • Added the new page under the "Get started" section

These changes provide users with a more comprehensive overview of XML comment support in DocFX, making it easier to understand and utilize the full range of documentation capabilities.

Fixes #9165.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• learn.microsoft.com
  • Triggering command: curl -s REDACTED (dns block)

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