[docs] Add Gentoo and Arch Linux packages to GDB instructions (#3521)

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3521
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: DraVee <dravee@eden-emu.dev>
Co-committed-by: DraVee <dravee@eden-emu.dev>

docs/Debug.md

@@ -29,10 +29,18 @@ Ignoring SIGSEGV when debugging in host:
 
 ### gdb
 
+You must have GDB installed for aarch64 to debug the target. Install it through your package manager, e.g.:
+* On Arch:
+  * `sudo pacman -Syu aarch64-linux-gnu-gdb`
+* On Gentoo:
+  * `sudo emerge --ask crossdev`
+  * `sudo crossdev -t aarch64-unknown-linux-gnu --ex-gdb`
+
 Run `./build/bin/eden-cli -c <path to your config file (see logs where you run eden normally to see where it is)> -d -g <path to game>`
+Or `Enable GDB Stub` at General > Debug, then hook up an aarch64-gdb:
+* `target remote localhost:6543`
 
-Then hook up an aarch64-gdb (use `yay aarch64-gdb` or `sudo pkg in arch64-gdb` to install)
-Then type `target remote localhost:1234` and type `c` (for continue) - and then if it crashes just do a `bt` (backtrace) and `layout asm`.
+Type `c` (for continue) and then if it crashes just do a `bt` (backtrace) and `layout asm`
 
 ### gdb cheatsheet