Improve clarity of PowerToys Hosts File Editor settings descriptions

[Copilot]

This PR addresses unclear and confusing setting descriptions in the PowerToys Hosts File Editor documentation that were reported in the feedback.

Changes Made

"Placement of additional content" setting:

• Before: "Default value is Top. If Bottom is selected, the file header is moved below hosts settings to the bottom."
• After: "Determines where new host entries are added in the hosts file. Default value is Top (new entries are added near the top of the file after the default Windows header comments). If Bottom is selected, new entries are added at the end of the file. This affects the organization of your hosts file and can impact which entries take precedence if there are conflicts."

"Consider loopback addresses as duplicates" setting:

• Before: "Loopback addresses (like 127.0.0.1 and ::1) are considered as duplicates."
• After: "When enabled, multiple loopback addresses (127.0.0.1, ::1) pointing to the same hostname are treated as duplicates. This prevents adding redundant entries and helps avoid conflicts. When disabled, you can add multiple loopback entries for the same hostname, which may be useful for testing different network configurations but could lead to unexpected behavior."

Issue Addressed

The original descriptions were problematic because:

1. The "Placement of additional content" description was contradictory and didn't explain the practical consequences
2. The "Consider loopback addresses as duplicates" description only defined what loopback addresses are, without explaining what the setting actually does or its consequences

The improved descriptions now clearly explain:

• What each setting controls
• What happens when different options are selected
• The practical consequences and use cases for each choice

Fixes #4909.

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