mosh: add notes to clarify runtime issues

Added notes to the mosh package help to clarify some runtime
issues related with it to ensure mosh will work properly after adding it.
This includes adding a proper LOCALE and an extra flag when using
mosh with dropbear.

Signed-off-by: Gonçalo Salazar <glbsalazar@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mosh/Config.in

@@ -24,4 +24,11 @@ config BR2_PACKAGE_MOSH
 	  allows roaming, and provides speculative local echo and line editing
 	  of user keystrokes.
 
+	  Mosh requires that the remote machine has a locale setting matching
+	  the one on the client.
+
+	  When using mosh with dropbear on a remote machine, the client needs mosh
+	  with a version above 1.3.0 and the --no-ssh-pty option needs to be passed
+	  when starting the connection.
+
 	  https://mosh.mit.edu