Fix documentation for basic auth

Fix the documentation for basic auth, specifically
the file path containing the mapping from username to
hashed passwords.

comanage-registry-basic-auth/README.md

@@ -88,7 +88,7 @@ To override the default bind mount or COPY in a password file created
 with the `htpasswd` command line tool. For example
 
 ```
-COPY passwords /etc/apache2/passwords
+COPY passwords /etc/apache2/basic-auth
 ```
 
 ## Ports