Spellcheck: Add missing words and sort expect.txt (#45251)

## PR Checklist

This PR adds missing words to the spell checker dictionary.

- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **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

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

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

@@ -635,6 +635,7 @@ GMEM
 GNumber
 googleai
 googlegemini
+Gotchas
 gpedit
 gpo
 GPOCA
@@ -647,8 +648,6 @@ GSM
 gtm
 guiddata
 GUITHREADINFO
-Gotcha
-Gotchas
 GValue
 gwl
 GWLP
@@ -894,9 +893,9 @@ Lclean
 Ldone
 Ldr
 LEFTALIGN
+leftclick
 LEFTSCROLLBAR
 LEFTTEXT
-leftclick
 LError
 LEVELID
 LExit
@@ -1022,6 +1021,7 @@ MENUITEMINFO
 MENUITEMINFOW
 MERGECOPY
 MERGEPAINT
+Metacharacter
 metadatamatters
 Metadatas
 metafile
@@ -1489,7 +1489,9 @@ regfile
 REGISTERCLASSFAILED
 REGISTRYHEADER
 REGISTRYPREVIEWEXT
+registryroot
 regkey
+regroot
 regsvr
 REINSTALLMODE
 releaseblog
@@ -1534,7 +1536,6 @@ riid
 RKey
 RNumber
 rollups
-ROOTOWNER
 rop
 ROUNDSMALL
 ROWSETEXT