Updated example title.

Author: AhsenBaig

docs/xquery/functions-on-string-values-lower-case.md

@@ -40,7 +40,7 @@ fn:lower-case($arg as xs:string?) as xs:string
 
 ## Examples  
 
-### A. Changing a string to upper case  
+### A. Changing a string to lower case  
  The following example changes the input string 'abcDEF!@4' to lower case.  
 
 ```