Fix typo in AI settings card description (#43757)

## Summary of the Pull Request
The word "cloud" does not use a vowel sound, so the preceding word
should be "A" instead of "An".

## PR Checklist

- [X] Closes: #43756
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [X] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

Co-authored-by: Erik Anderson <erikan@ntdev.microsoft.com>

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

@@ -3410,7 +3410,7 @@ Activate by holding the key for the character you want to add an accent to, then
     <value>An AI powered tool to put your clipboard content into any format you need, focused towards developer workflows.</value>
   </data>
   <data name="AdvancedPaste_EnableAISettingsCardDescription.Text" xml:space="preserve">
-    <value>Transform your clipboard content with the power of AI. An cloud or local endpoint is required.</value>
+    <value>Transform your clipboard content with the power of AI. A cloud or local endpoint is required.</value>
   </data>
   <data name="AdvancedPaste_EnableAISettingsCardDescriptionLearnMore.Content" xml:space="preserve">
     <value>Learn more</value>