Fix reference

Mathias Vorreiter Pedersen · jbj · web-flow · commit e79c0820ef88 · 2020-01-17T13:51:14.000+01:00
Co-Authored-By: Jonas Jensen &lt;jbj@github.com&gt;
diff --git a/cpp/ql/src/Likely Bugs/Underspecified Functions/ImplicitFunctionDeclaration.qlhelp b/cpp/ql/src/Likely Bugs/Underspecified Functions/ImplicitFunctionDeclaration.qlhelp
@@ -23,6 +23,6 @@ the function declaration has not been included.</p>
 </example>
 
 <references>
-<li>SEI CERT C Coding Standard: <a href="https://wiki.sei.cmu.edu/confluence/display/c/DCL31-C.+Declare+identifiers+before+using+them"> DCL20-C. Explicitly specify void when a function accepts no arguments </a></li>
+<li>SEI CERT C Coding Standard: <a href="https://wiki.sei.cmu.edu/confluence/display/c/DCL31-C.+Declare+identifiers+before+using+them">DCL31-C. Declare identifiers before using them</a></li>
 </references>
 </qhelp>
