Note user name and password in docs on boot2docker

Docker-DCO-1.1-Signed-off-by: Nathan LeClaire <nathan.leclaire@docker.com> (github: nathanleclaire)

docs/sources/installation/mac.md

@@ -85,6 +85,8 @@ implementation.
 
 # Further details
 
+If you are curious, the username for the boot2docker default user is `docker` and the password is `tcuser`.
+
 The Boot2Docker management tool provides several commands:
 
     $ ./boot2docker

docs/sources/installation/windows.md

@@ -68,6 +68,8 @@ The Boot2Docker management tool provides several commands:
 
 ## Container port redirection
 
+If you are curious, the username for the boot2docker default user is `docker` and the password is `tcuser`.
+
 The latest version of `boot2docker` sets up a host only network adaptor which provides access to the container's ports.
 
 If you run a container with an exposed port: