Fix debug example to actually show led-roulette

Author: sirhcel

src/05-led-roulette/debug-it.md

@@ -54,10 +54,10 @@ invokes a subroutine call to the `main` function using an ARM branch and link in
 ```
 (gdb) disassemble /m
 Dump of assembler code for function main:
-8       #[entry]
+7       #[entry]
    0x080001ec <+0>:     push    {r7, lr}
    0x080001ee <+2>:     mov     r7, sp
-=> 0x080001f0 <+4>:     bl      0x80001f6 <hello_world::__cortex_m_rt_main>
+=> 0x080001f0 <+4>:     bl      0x80001f6 <_ZN12led_roulette18__cortex_m_rt_main17he61ef18c060014a5E>
    0x080001f4 <+8>:     udf     #254    ; 0xfe
 
 End of assembler dump.