Fix debugging binary name

src/getting-started/03.00.DEBUG.md

@@ -28,14 +28,14 @@ At this time, we are not interested in that "pre-main" part so let's skip right
 the `main` function. We'll do that using a breakpoint:
 
 ```
-(gdb) break rustled::main
+(gdb) break main
 Breakpoint 1 at 0x8000218: file src/main.rs, line 8.
 
 (gdb) continue
 Continuing.
 Note: automatically using hardware breakpoints for read-only addresses.
 
-Breakpoint 1, rustled::main () at src/rustled/src/main.rs:13
+Breakpoint 1, main () at src/microrust-start/src/main.rs:13
 13          let x = 42;
 ```