Swift: Replace dead link in .qhelp.

Author: geoffw0

swift/ql/src/queries/Security/CWE-312/CleartextLogging.qhelp

@@ -40,7 +40,7 @@ Instead, you should encrypt or obfuscate the credentials, or omit them entirely:
 
 <li>M. Dowd, J. McDonald and J. Schuhm, <i>The Art of Software Security Assessment</i>, 1st Edition, Chapter 2 - 'Common Vulnerabilities of Encryption', p. 43. Addison Wesley, 2006.</li>
 <li>M. Howard and D. LeBlanc, <i>Writing Secure Code</i>, 2nd Edition, Chapter 9 - 'Protecting Secret Data', p. 299. Microsoft, 2002.</li>
-<li>OWASP: <a href="https://www.owasp.org/index.php/Password_Plaintext_Storage">Password Plaintext Storage</a>.</li>
+<li>OWASP: <a href="https://cheatsheetseries.owasp.org/cheatsheets/Logging_Cheat_Sheet.html">Logging Cheat Sheet</a>.</li>
 
 </references>
 </qhelp>