message: [Docs] Fix code formattign in variable.rst
  Fixes missing newline between :: and the actual code.
diff: @@ -764,6 +764,7 @@ command, supports a --summary option that tells LLDB to use the named summary
  given instead of the default one.
  ::
  +
  (lldb) type summary add --summary-string "x=${var.integer}" --name NamedSummary
  (lldb) frame variable one
  (i_am_cool) one = int = 3, float = 3.14159, char = 69
  