Update Security.md (#964)

Fixing a small typo.

SECURITY.md

@@ -5,7 +5,7 @@ The latest release and the current master branch
 
 ## Reporting a Vulnerability
 
-Report a vulnerability to the project maintainers by rainsg a security advisory [here](https://github.com/OWASP/Nettacker/security/advisories/new)
+Report a vulnerability to the project maintainers by raising a security advisory [here](https://github.com/OWASP/Nettacker/security/advisories/new)
 
 ## Contacting Maintainers
 The Project Leaders are listed on the OWASP Nettacker Project page here: [https://owasp.org/nettacker](https://owasp.org/nettacker)