Minor updates to qhelp file

Author: felicitymay

java/ql/src/experimental/Security/CWE/CWE-643/XPathInjection.qhelp

@@ -5,14 +5,14 @@
 <overview>
 <p>
 If an XPath expression is built using string concatenation, and the components of the concatenation
-include user input, a user is likely to be able to create a malicious XPath expression.
+include user input, it makes it very easy for a user to create a malicious XPath expression.
 </p>
 </overview>
 
 <recommendation>
 <p>
-If user input must be included in an XPath expression, pre-compile the query and use variable
-references to include the user input.
+If user input must be included in an XPath expression, either sanitize the data or pre-compile the query
+and use variable references to include the user input.
 </p>
 <p>
 XPath injection can also be prevented by using XQuery.
@@ -22,14 +22,14 @@ XPath injection can also be prevented by using XQuery.
 
 <example>
 <p>
-In the first, second, and third example, the code accepts a name and password specified by the user, and uses this
+In the first three examples, the code accepts a name and password specified by the user, and uses this
 unvalidated and unsanitized value in an XPath expression. This is vulnerable to the user providing
 special characters or string sequences that change the meaning of the XPath expression to search
 for different values.
 </p>
 
 <p>
-In the fourth example, the code utilizes setXPathVariableResolver which prevents XPath Injection.
+In the fourth example, the code uses `setXPathVariableResolver` which prevents XPath injection.
 </p>
 <p>
 The fifth example is a dom4j XPath injection example.
@@ -39,6 +39,6 @@ The fifth example is a dom4j XPath injection example.
 
 <references>
 <li>OWASP: <a href="https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/07-Input_Validation_Testing/09-Testing_for_XPath_Injection">Testing for XPath Injection</a>.</li>
-<li>OWASP: <a href="https://www.owasp.org/index.php/XPATH_Injection">XPath Injection</a>.</li>
+<li>OWASP: <a href="https://owasp.org/www-community/attacks/XPATH_Injection">XPath Injection</a>.</li>
 </references>
 </qhelp>