docs(settings-ui): update Advanced Paste OOBE description for AI features (#45233)

## Summary of the Pull Request

Updates the Advanced Paste OOBE (Out-of-Box Experience) description to
accurately reflect that AI features no longer require specifically an
OpenAI API key. The new text clarifies:
- Changed "markdown" to "Markdown" and "json" to "JSON" for proper
casing
- Replaced "100% opt-in and requires an Open AI key" with "opt-in AI
feature that can use an online or local language model endpoint"

This fixes the outdated description that still referenced OpenAI as the
only option.

## PR Checklist

- [x] Closes: #44044
- [x] **Communication:** Documentation/string fix, no core contributor
discussion needed
- [ ] **Tests:** N/A - string-only change
- [x] **Localization:** The updated string is in the localizable
Resources.resw file
- [ ] **Dev docs:** N/A
- [ ] **New binaries:** N/A
- [ ] **Documentation updated:** N/A

## Detailed Description of the Pull Request / Additional comments

The change updates
\src/settings-ui/Settings.UI/Strings/en-us/Resources.resw\ to fix the
\Oobe_AdvancedPaste.Description\ string that incorrectly stated AI
features require an OpenAI key.

## Validation Steps Performed

- Verified the string change is valid XML
- Confirmed the updated description accurately reflects current Advanced
Paste AI capabilities

src/settings-ui/Settings.UI/Strings/en-us/Resources.resw

@@ -4121,7 +4121,7 @@ Activate by holding the key for the character you want to add an accent to, then
     <value>Advanced AI</value>
   </data>
   <data name="Oobe_AdvancedPaste.Description" xml:space="preserve">
-    <value>Advanced Paste is a tool to put your clipboard content into any format you need, focused towards developer workflows. It can paste as plain text, markdown, or json directly with the UX or with a direct keystroke invoke. These are fully locally executed. In addition, it has an AI powered option that is 100% opt-in and requires an Open AI key. Note: this will replace the formatted text in your clipboard with the selected format.</value>
+    <value>Advanced Paste is a tool to put your clipboard content into any format you need, focused towards developer workflows. It can paste as plain text, Markdown, or JSON directly with the UX or with a direct keystroke invoke. These are fully locally executed. In addition, it has an opt-in AI feature that can use an online or local language model endpoint. Note: this will replace the formatted text in your clipboard with the selected format.</value>
   </data>
   <data name="Oobe_AdvancedPaste.Title" xml:space="preserve">
     <value>Advanced Paste</value>