Updating wording for WinUI2 bug consideration (#9129)

* Adding document for handling contributions, and links to it

* Fixing links

* Fixing link

* Updating wording

* Removing WinUI Design bug template as it is unused

* Punctuation fixes

* Updating wording for clarity per community feedback

* Updating wording for WinUI 2 bug handling

* Updating wording to verbiage about long-term planning

* Updating wording for WinUI2 bug consideration

docs/contribution_handling.md

@@ -33,7 +33,7 @@ For more info about our longer-term planning, see the [Windows App SDK feature r
 
 ### WinUI 2
 
-The WinUI team is currently spending its time on WinUI 3. To help with this focus, new bugs filed against WinUI 2 are closed in this repo unless they're a security issue or are business critical.
+The WinUI team is currently spending its time on WinUI 3. To help with this focus, any new bug filed against WinUI 2 is closed in this repo unless it's a security issue or is critical to our business priorities.
 
 ### WinUI 3