Update javascript/ql/src/Security/CWE-400/PrototypePollutionUtility.qhelp

Co-Authored-By: mc <42146119+mchammer01@users.noreply.github.com>

Author: asgerf

javascript/ql/src/Security/CWE-400/PrototypePollutionUtility.qhelp

@@ -42,7 +42,7 @@
 
   <p>
     However, if <code>src</code> is the object <code>{"__proto__": {"isAdmin": true}}</code>,
-    it will inject the property <code>isAdmin: true</code> in in <code>Object.prototype</code>.
+    it will inject the property <code>isAdmin: true</code> in <code>Object.prototype</code>.
   </p>
 
   <p>