powershell-style-guide.md: Update PlatyPS schema link (#11526)

* powershell-style-guide.md: Update PlatyPS schema link

The old link broke.

* Update powershell-style-guide.md

Restoring numbered link references

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Co-authored-by: Sean Wheeler <sean.wheeler@microsoft.com>

Author: SamB

reference/docs-conceptual/community/contributing/powershell-style-guide.md

@@ -338,6 +338,6 @@ Basic formatting guidelines:
 [05]: editorial-checklist.md
 [06]: https://en.wikipedia.org/wiki/PascalCase
 [07]: https://github.com/powershell/platyps
-[08]: https://github.com/PowerShell/platyPS/blob/master/platyPS.schema.md
+[08]: https://github.com/PowerShell/platyPS/blob/master/docs/developer/platyPS/platyPS.schema.md
 [09]: https://pandoc.org
 [10]: overview.md#get-started-writing-docs