Update JndiInjection.qhelp

Improve negation

Author: mchammer01

java/ql/src/Security/CWE/CWE-074/JndiInjection.qhelp

@@ -11,7 +11,7 @@ code execution.</p>
 </overview>
 
 <recommendation>
-<p>The general recommendation is to not pass untrusted data to the <code>InitialContext.lookup
+<p>The general recommendation is to avoid passing untrusted data to the <code>InitialContext.lookup
 </code> method. If the name being used to look up the object must be provided by the user, make
 sure that it's not in the form of an absolute URL or that it's the URL pointing to a trused server.
 </p>