Adding the missing command for showing all the internal interfaces for a router.

Updated replaceable values to format correctly.
Changed a L2 -> an L2; a L3 -> an L3; a SQL -> an SQL
Other small edits

Closes-Bug: #1344264
Change-Id: Ia976584a79f099327eab968fc18695b4189573a4
Merge "Adding the missing command for showing all the internal interfaces for a router."