Update README.md to indicate this is no longer a test repo. (#1)

Author: kbeyls

README.md

@@ -1,7 +1,4 @@
-This is a test repository to experiment with GitHub's "privately reporting a
-security vulnerability" workflow, see
-<https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability>
-
-If or when security vulnerabilities or advisories appear against this specific
-repository, they are expected to be as a result of experimenting with this
-workflow and not be actual vulnerabilities.
+This repository exists to enable reporting of LLVM security issues to the [LLVM
+security group](https://llvm.org/docs/Security.html) using GitHub's "privately
+reporting a security vulnerability" workflow, see
+<https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability>.