docs: fix a typo in HACKING.md

Author: iammattcoleman

docs/HACKING.md

@@ -142,7 +142,7 @@ dracut_install_dir/modules.d/
 	 This function of module-setup.sh is called to install all
 	 non-kernel files. dracut supplies several install functions that are
 	 specialized for different file types.  Browse through dracut-functions
-	 fore more details.  dracut also provides a $moddir variable if you
+	 for more details.  dracut also provides a $moddir variable if you
 	 need to install a file from the module directory, such as an initrd
 	 hook, a udev rule, or a specialized executable.