security: link the docs

app/templates/security.html

@@ -9,7 +9,10 @@
   </div>
   <div class="card-body overflow-auto">
 
-    <p class="text-muted">{{ known|length }} out of {{ sources|length }} packages contain enough metadata for vulnerability scanning.</p>
+    <p class="text-muted">{{ known|length }} out of {{ sources|length }}
+    packages contain enough metadata for vulnerability scanning. For more
+    information see <a href="https://www.msys2.org/dev/vulnerabilities">the
+    vulnerability reporting documentation</a>.</p>
 
     <table class="table table-hover table-sm" style="table-layout: fixed; width:100%;">
       <colgroup>