New+: Fix French translation guidance (Nouveau+ not Nouveauté+) (#47225)

## Summary of the Pull Request

French translation of "New+" was rendered as "Nouveauté+" ("Novelty+")
instead of "Nouveau+" ("New+"), inconsistent with how Windows itself
translates the "New" context menu item in French. This updates
translator guidance comments in the English resource files to explicitly
call out the correct French form.

## PR Checklist

- [ ] **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
- [ ] **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

## Detailed Description of the Pull Request / Additional comments

Translator-facing `<comment>` fields updated across three resource files
to explicitly state the correct French translation and flag the wrong
one:

- **`NewShellExtensionContextMenu/resources.resx`** and
**`NewShellExtensionContextMenu.win10/resources.resx`** —
`context_menu_item_new`:
> _"…e.g. Danish it would become Ny+, **French it would become Nouveau+
(not Nouveauté+)**"_

- **`Settings.UI/Strings/en-us/Resources.resw`** — five `NewPlus.*` /
`Oobe_NewPlus.*` strings:
> _"…Localize product name in accordance with Windows New. **e.g. French
would be Nouveau+ (not Nouveauté+)**"_

Actual `.lcl` translation files are managed by the CDPX localization
pipeline; these comment updates feed directly into the guidance the
localization team sees when updating those files.

## Validation Steps Performed

Comment-only changes to XML resource files; no runtime behavior
affected. Verified all targeted entries were updated and no existing
checked-in `Nouveauté` strings remain in the repo.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: niels9001 <9866362+niels9001@users.noreply.github.com>

.github/actions/spell-check/expect.txt

@@ -1234,6 +1234,8 @@ NOTSRCCOPY
 NOTSRCERASE
 Notupdated
 notwindows
+NOTXORPEN
+Nouveaut
 nowarn
 NOZORDER
 NPH