Remove ownership TSG in PR template (sonic-net#16503)

Signed-off-by: Zhaohui Sun <zhaohuisun@microsoft.com>

Author: ZhaohuiS

.github/PULL_REQUEST_TEMPLATE.md

@@ -26,7 +26,6 @@ Fixes # (issue)
 - [ ] Testbed and Framework(new/improvement)
 - [ ] New Test case
     - [ ] Skipped for non-supported platforms
-    - [ ] Add ownership [here](https://msazure.visualstudio.com/AzureWiki/_wiki/wikis/AzureWiki.wiki/744287/TSG-for-ownership-modification)(Microsft required only)
 - [ ] Test case improvement