Improved docs (allman syntax)

content/docs/guide/generics.mdx

@@ -12,15 +12,17 @@ T id<T>(T x)
 }
 
 // Generic struct
-struct Pair<A, B> {
+struct Pair<A, B>
+{
     A first,
     B second,
 }
 
 // Generic enum
-enum Result<T, E> {
-    Ok(T),
-    Err(E),
+enum Result<T, E>
+{
+    Ok(T);
+    Err(E);
 }
 
 // Generic with trait bounds