Merge branch 'deploy-key-doc-improvement' into 'master'

Deploy-key-doc-improvement

doc/README.md

@@ -11,6 +11,7 @@
 + [Raketasks](raketasks/README.md)
 + [Release](release/README.md)
 + [Security](security/README.md)
++ [SSH](ssh/README.md)
 + [System hooks](system_hooks/system_hooks.md)
 + [Update](update/README.md)
 + [Web hooks](web_hooks/web_hooks.md)

doc/ssh/README.md

++ [Deploy keys](deploy_keys.md)
++ [SSH](ssh.md)

doc/ssh/deploy_keys.md

@@ -9,4 +9,4 @@ After this the machine that uses the corresponding private key has read-only acc
 
 You can't add the same deploy key twice with the 'New Deploy Key' option.
 If you want to add the same key to another project please enable it in the list that says 'Deploy keys from projects available to you'.
-You need to be the owner of the deploy key to see it in this list. 
+All the deploy keys of all the projects you have access to are available. This project access can happen through being a direct member of the project or through a group. See `def accessible_deploy_keys` in `app/models/user.rb` for more information.