Use "Unix-link / Bash" instead of Linux (#8508)

Author: eksperimental

lib/iex/lib/iex.ex

@@ -40,7 +40,7 @@ defmodule IEx do
   the `ERL_AFLAGS` environment variable and make sure that it is set
   accordingly on your terminal/shell configuration.
 
-  On Linux:
+  On Unix-like / Bash:
 
       export ERL_AFLAGS="-kernel shell_history enabled"