Adjust language for new security guidelines (#734)

Author: AlexJerabek

SECURITY.md

@@ -14,7 +14,7 @@ Instead, please report them to the Microsoft Security Response Center (MSRC) at
 
 If you prefer to submit without logging in, send email to [[email protected]](mailto:[email protected]).  If possible, encrypt your message with our PGP key; please download it from the [Microsoft Security Response Center PGP Key page](https://aka.ms/opensource/security/pgpkey).
 
-You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message. Additional information can be found at [microsoft.com/msrc](https://aka.ms/opensource/security/msrc). 
+You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message. Additional information can be found at [microsoft.com/msrc](https://aka.ms/opensource/security/msrc).
 
 Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:
 
@@ -24,7 +24,7 @@ Please include the requested information listed below (as much as you can provid
   * Any special configuration required to reproduce the issue
   * Step-by-step instructions to reproduce the issue
   * Proof-of-concept or exploit code (if possible)
-  * Impact of the issue, including how an attacker might exploit the issue
+  * Impact of the issue, including how a threat actor might exploit the issue
 
 This information will help us triage your report more quickly.