Update guidelines-for-legal-requests-of-user-data.md (#16756)

Remove legal@support.github.com email address from legal request guidelines

Co-authored-by: Melanie Yarbrough <11952755+myarb@users.noreply.github.com>

content/github/site-policy/guidelines-for-legal-requests-of-user-data.md

@@ -216,8 +216,6 @@ c/o Corporation Service Company
 Sacramento, CA 95833-3505
 ```
 
-You may also send a courtesy copy to legal@support.github.com.
-
 Please make your requests as specific and narrow as possible, including the following information:
 
 - Full information about authority issuing the request for information