[gnome-boxes.wiki] Update Style Guide

[Felipe Borges <felipeborges src gnome org>]

commit b762978abe0a06f0d63f29c26d61564d98e3a949
Author: Felipe Borges <felipeborges gnome org>
Date:   Wed Jan 19 16:04:02 2022 +0000

    Update Style Guide

 Style-Guide.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Style-Guide.md b/Style-Guide.md
index 3987af2..d9ae6f7 100644
--- a/Style-Guide.md
+++ b/Style-Guide.md
@@ -39,7 +39,7 @@ The coding style to respect in this project is very similar to most Vala project
  * ''Prefer'' descriptive names over abbreviations (unless well-known)
    & shortening of names. E.g discoverer over disco.
 
- * Use 'var' in variable declarations wherever possible.
+ * Use explicit types in variable declarations wherever possible. `GLib.Object object = ...`
 
  * Use 'as' to cast wherever possible.