doc: cifsd: change the reference to configuration.txt

added documentation for cifsd. There, it points to a file
named:
        Documentation/configuration.txt

This confuses Kernel scripts, as they think that this is a
document within the Kernel tree, instead of a file from
some other place.

Replace it by an hyperlink to the ksmbd-tools tree, in order
to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Documentation/filesystems/cifs/cifsd.rst

@@ -114,8 +114,8 @@ How to run
 	# ksmbd.adduser -a <Enter USERNAME for SMB share access>
 
 3. Create /etc/ksmbd/smb.conf file, add SMB share in smb.conf file
-	- Refer smb.conf.example and Documentation/configuration.txt
-	  in ksmbd-tools
+	- Refer smb.conf.example and
+          https://github.com/cifsd-team/ksmbd-tools/blob/master/Documentation/configuration.txt
 
 4. Insert ksmbd.ko module