fix link to docs, add info about mailinglists, change contact info

uffd/selfservice/templates/selfservice/newuser.mail.txt

@@ -5,7 +5,7 @@ password: {{ url_for('selfservice.token_password', token=token, _external=True)
 
 **The link is valid for 48h**
 
-If you were granted access to crews or orbits you have been automatically subscribed to the corresponding mailinglists.
+If you were granted access to crews or orbits, you have been automatically subscribed to the corresponding mailinglists.
 Please find and read the documentation for all services you are granted access to at https://sso.cccv.de/services/.
 
 If you have no idea why someone would create an account for you to be used for the next CCC event organization or have