fix up paths, correct language

A couple of the documentation files referred to were being referenced
by their names as shipped to unix systems (e.g. INSTALL), not as they
are shipped in the Windows .zip (e.g. INSTALL.txt).

Also fix a couple of infelicitous uses of English...

README.WIN32

@@ -43,8 +43,8 @@ even if mod_ucam_webauth.so is in fact present.
 
 Once these steps are completed, configure Apache to use
 mod_ucam_webauth as described in sections 3 and 4 ('Operating
-requirements' and 'Initial configuration') of INSTALL, and in
-README.Config, but note the following:
+requirements' and 'Initial configuration') of INSTALL.txt, and in
+README_Config.txt, but note the following:
 
 * The 'apxs' tool is not available. For a default installation of the
   Apache project distribution the RSA public keys should by default be
@@ -55,8 +55,8 @@ README.Config, but note the following:
   name of the key file, and that this may be hidden if Windows is
   configured to hide known file name suffixes.
 
-* If time synchronisation is required can be configured from Start ->
-  Settings -> Control Panel -> Date and Time -> Internet 
+* If time synchronisation is required, it can be configured from Start
+  -> Settings -> Control Panel -> Date and Time -> Internet
 
 * For a default installation of the Apache project distribution, the
   default configuration file is called 'httpd.conf' and will be found
@@ -66,7 +66,7 @@ README.Config, but note the following:
   error log file will be found in a file called 'error.log' in the
   'logs' directory within the Apache installation directory.
 
-* The necessary OpenSSL components are included in the compiled module
+* The necessary OpenSSL components are included in the compiled module.
 
 --
 $Id: README.WIN32,v 1.11 2011-09-22 13:56:12 jw35 Exp $