Updates servicing doc and servicing template (#41844)
* add template
* edit servicing doc
* Update PULL_REQUEST_TEMPLATE/servicing_pull_request_template.md
Co-authored-by: Santiago Fernandez Madero <safern@microsoft.com>
* Apply suggestions from code review
Co-authored-by: Dan Moseley <danmose@microsoft.com>
Co-authored-by: Santiago Fernandez Madero <safern@microsoft.com>
* add exclude paths
Co-authored-by: Santiago Fernandez Madero <safern@microsoft.com>
Co-authored-by: Dan Moseley <danmose@microsoft.com>