Console: Added escaping console while inside ssh

obmc-console-client is an ssh session. To escape while already
inside an ssh session a double ~ is required.
There was a "Note" already, but made more clear with an
example.

Resolves openbmc/openbmc#898

Tested: Copied into https://jbt.github.io/markdown-editor/
Change-Id: Icb76b42338799d832e3bc1582810726183dff773
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/console.md b/console.md
index 2b83d8d..6b1b5c6 100644
--- a/console.md
+++ b/console.md
@@ -30,7 +30,12 @@
     return ~ .
 
 Note that if you're on an ssh connection, you'll need to 'escape' the ~
-character, by entering it twice.
+character, by entering it twice:
+
+    return ~ ~ .
+
+This is because obmc-console-client is an ssh session, and a double `~` is
+required to escape the "inner" (obmc-console-client) ssh session.
 
 Logging
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