Document that variable replacement now takes place in the test file <stdout> section.

tests/FILEFORMAT

@@ -289,7 +289,8 @@ actually sent by the client
 Variables are substituted as in the <command> section.
 </protocol>
 <stdout [mode="text"] [nonewline="yes"]>
-This verifies that this data was passed to stdout.
+This verifies that this data was passed to stdout.  Variables are
+substituted as in the <command> section.
 
 Use the mode="text" attribute if the output is in text mode on platforms that
 have a text/binary difference.

tests/data/test1028

@@ -79,7 +79,7 @@ Date: Thu, 09 Nov 2010 14:49:00 GMT
 Server: test-server/fake swsclose
 Content-Type: text/html
 Funny-head: yesyes
-Location: ftp://127.0.0.1:8992/10280002
+Location: ftp://%HOSTIP:%FTPPORT/10280002
 Content-Length: 0
 Connection: close