Fix spelling in README.CONFIGURE (#17)

Author: j-halla

docs/README.CONFIGURE

@@ -1,8 +1,8 @@
-You will need either a custom authentification module or a working "users.auth.php"
+You will need either a custom authentication module or a working "users.auth.php"
 in "dw/conf/users.auth.php". A normal dokuwiki install will generate one using the
-credentials you used during the install.
+credentials you used during the installation.
 
-To use the CVS authtentification module, an environment variable is required, its
+To use the CVS authentication module, an environment variable is required, its
 name is "dokuwikitoken". See the sample lighttpd.conf for an example (or use
 SetEnv in Apache). Ask Hannes ([email protected]) for the current valid plain text
 token.