Update isxfunc.xml

Add info about USERPROFILE environment variable

ISHelp/isxfunc.xml

@@ -1478,7 +1478,7 @@ end;</pre></example>
       <function>
         <name>GetTempDir</name>
         <prototype>function GetTempDir: String;</prototype>
-        <description><p>Returns fully qualified path of the temporary directory, with trailing backslash. This does not use the Win32 function GetTempPath, due to platform differences.<br />Gets the temporary file path as follows:<br />1. The path specified by the TMP environment variable.<br />2. The path specified by the TEMP environment variable, if TMP is not defined or if TMP specifies a directory that does not exist.<br />3. The Windows directory, if both TMP and TEMP are not defined or specify nonexistent directories.</p></description>
+        <description><p>Returns fully qualified path of the temporary directory, with trailing backslash. This does not use the Win32 function GetTempPath, due to platform differences.<br />Gets the temporary file path as follows:<br />1. The path specified by the TMP environment variable.<br />2. The path specified by the TEMP environment variable, if TMP is not defined or if TMP specifies a directory that does not exist.<br />3. On Win32 platform, the path specified by the USERPROFILE environment variable, if both TMP and TEMP are not defined or specify nonexistent directories.<br />4. The Windows directory, if all the above TMP, TEMP and USERPROFILE are not defined or specify nonexistent directories.</p></description>
       </function>
       <function>
         <name>GetShellFolder</name>