Update cpp/ql/src/Best Practices/GuardedFree.qhelp

Co-authored-by: mc <[email protected]>

Author: jketema

cpp/ql/src/Best Practices/GuardedFree.qhelp

@@ -21,7 +21,7 @@
 <references>
 <li>
     The Open Group Base Specifications Issue 7, 2018 Edition:
-    <a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/free.html">free - free allocated memory</a>
+    <a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/free.html">free - free allocated memory</a>.
 </li>
 </references>