Add missing firewall rule instructions for AuthHost debugging with Fiddler

[Copilot]

• Add comprehensive firewall configuration instructions with both command-line and GUI approaches
• Fix numbered list format to use "1." for all items per markdown best practice

Fixed markdown numbered list in the Windows Defender Firewall instructions to use "1." for all items instead of incremental numbering (1., 2., 3., etc.). This follows markdown best practices and makes it easier to insert new steps without renumbering subsequent items.

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[learn-build-service-prod]

Learn Build status updates of commit 7f06d18:

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[learn-build-service-prod]

Learn Build status updates of commit 2b9d8e7:

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Learn Build status updates of commit 2b9d8e7:

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[alvinashcraft]

@copilot Numbered lists in markdown should all use the number 1. The markdown parser will correctly update the subsequent lines to have incrementing numbers. This makes it easier to insert new lines in the middle of the numbered list later without renumbering the following items.

[Copilot]

@copilot Numbered lists in markdown should all use the number 1. The markdown parser will correctly update the subsequent lines to have incrementing numbers. This makes it easier to insert new lines i...

Updated the numbered list to use "1." for all items as requested. This change is in commit 57f505d.

[learn-build-service-prod]

Learn Build status updates of commit 57f505d:

✅ Validation status: passed

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Learn Build status updates of commit e9df4ea:

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Learn Build status updates of commit 8dcdb1a:

✅ Validation status: passed

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uwp/security/web-authentication-broker.md	✅Succeeded

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