Change 'text' formatting to 'console' on console code blocks

Author: karreiro

src/ch01-02-hello-world.md

@@ -155,7 +155,7 @@ entering the `ls` command in your shell. On Linux and macOS, you’ll see two
 files. With PowerShell on Windows, you’ll see the same three files that you
 would see using CMD.
 
-```text
+```console
 $ ls
 main  main.rs
 ```

src/ch12-06-writing-to-stderr-instead-of-stdout.md

@@ -66,7 +66,7 @@ instead of standard output using `eprintln!`</span>
 After changing `println!` to `eprintln!`, let’s run the program again in the
 same way, without any arguments and redirecting standard output with `>`:
 
-```text
+```console
 $ cargo run > output.txt
 Problem parsing arguments: not enough arguments
 ```