fix broken link (#18490)

files/en-us/web/xpath/functions/index.md

@@ -8,7 +8,7 @@ tags:
   - XSLT
   - XSLT_Reference
 ---
-{{ XsltRef() }} The following is an annotated list of core [XPath](/en-US/docs/Web/XPath) functions and [XSLT](/en-US/XSLT)-specific additions to XPath, including a description, syntax, a list of arguments, result-type, source in the appropriate W3C Recommendation. For further information on using XPath/XSLT functions, please see the [For Further Reading](/en-US/docs/Web/XSLT/Transforming_XML_with_XSLT) page.
+{{ XsltRef() }} The following is an annotated list of core [XPath](/en-US/docs/Web/XPath) functions and [XSLT](/en-US/docs/Web/XSLT)-specific additions to XPath, including a description, syntax, a list of arguments, result-type, source in the appropriate W3C Recommendation. For further information on using XPath/XSLT functions, please see the [For Further Reading](/en-US/docs/Web/XSLT/Transforming_XML_with_XSLT) page.
 
 - [boolean()](/en-US/docs/Web/XPath/Functions/boolean)
 - [ceiling()](/en-US/docs/Web/XPath/Functions/ceiling)