docs: fix link for reporting new vulnerabilities.

The advice to select "Report a security vulnerability" on the new issue
page only takes you to the Security Policy page, which is the same document
you are reading.  From there the actual link is quite buried, so put a button inline.

SECURITY.md

@@ -15,7 +15,9 @@ in older versions.
 
 ## Reporting a Vulnerability
 
-Please use the "Report a VUlnerability" button on the new Issue page to report vulnerabilities.
+Please use the button below.
+
+[![Report a Vulnerability]][https://github.com/make-all/tuya-local/security/advisories/new]
 
 This will give the developers a heads up about the issue before posting publicly, to protect other users who may be affected.
 Security issues will be treated as top priority, so you should get a response within 72 hours, usually much sooner.