Revise SECURITY.md for accuracy and clarity

Fixed typo

Author: garland3

SECURITY.md

@@ -11,7 +11,7 @@ Please do not report security vulnerabilities through public GitHub issues, disc
 
 ### 2. Report privately
 
-Send an email to: agarlan@sandia.vo
+Send an email to: agarlan@sandia.gov
 
 Include the following information:
 - Description of the vulnerability
@@ -37,3 +37,4 @@ Include the following information:
 
 We appreciate the security research community and will acknowledge researchers who report vulnerabilities responsibly.
 
+