[gtk-web: 1/3] Update deprecated ` to $()

[Emmanuele Bassi <ebassi src gnome org>]

commit 76e4c43b5c13c4abfafdf31566c18412ff2545aa
Author: krotera <01101011 tuta io>
Date:   Sat Jul 23 17:17:53 2022 +0000

    Update deprecated ` to $()
    
    https://mywiki.wooledge.org/BashFAQ/082

 _docs/getting-started/hello-world.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/_docs/getting-started/hello-world.md b/_docs/getting-started/hello-world.md
index cce7677..aad1414 100644
--- a/_docs/getting-started/hello-world.md
+++ b/_docs/getting-started/hello-world.md
@@ -76,7 +76,7 @@ main (int    argc,
 You can compile the program above with GCC using:
 
 ```shell
-gcc -o hello-world-gtk hello-world-gtk.c `pkg-config --cflags --libs gtk4`
+gcc -o hello-world-gtk hello-world-gtk.c $(pkg-config --cflags --libs gtk4)
 ```
 
 <div class="alert alert-tertiary">