[retro-gtk] hacking: Use the code style for code-like text

[Adrien Plazas <aplazas src gnome org>]

commit 33b7be21c93bf1603817b7745901cb6aebff3551
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Oct 22 16:25:09 2020 +0200

    hacking: Use the code style for code-like text

 HACKING.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/HACKING.md b/HACKING.md
index 7602ceb5..5218e49b 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -17,7 +17,7 @@ Fixes https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1
 ### The Tag
 
 The tag tells which part of the software is affected; it must be in kebab-case,
-it shouldn't include fle extensions, and it shouldn't have the *retro-* prefix.
+it shouldn't include fle extensions, and it shouldn't have the `retro-` prefix.
 
 If the change is too global to be relevant to any specific part, you can omit
 the tag completely.