Update readme.md (#41150)

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fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
The link to styling in developer documentation was not working. The path
was wrong.
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## PR Checklist

- [ ] Closes: #xxx
- [ ] **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
- [x] **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

doc/devdocs/readme.md

@@ -52,7 +52,7 @@ Once you've discussed your proposed feature/fix/etc. with a team member, and an
 ## Rules
 
 - **Follow the pattern of what you already see in the code.**
-- [Coding style](development/style.md).
+- [Coding style](style.md).
 - Try to package new functionality/components into libraries that have nicely defined interfaces.
 - Package new functionality into classes or refactor existing functionality into a class as you extend the code.
 - When adding new classes/methods/changing existing code, add new unit tests or update the existing tests.