docs: Fix formatting issue in PROTOCOL.md
diff --git a/PROTOCOL.md b/PROTOCOL.md
index 46641843..a664f0ce 100644
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -521,6 +521,7 @@ struct limine_framebuffer {
uint64_t mode_count;
struct limine_video_mode **modes;
};
+```
`modes` is an array of `mode_count` pointers to `struct limine_video_mode` describing the
available video modes for the given framebuffer.
