h2: add better comment about how to use root.enableLogScope

crates/haku2/src/haku2.zig

@@ -24,7 +24,7 @@ pub const std_options: std.Options = .{
 pub fn enableLogScope(scope: @TypeOf(.enum_literal)) bool {
     // Replace any of the false returns below to enable log scopes for the build.
     if (scope == .vm)
-        return true
+        return false
     else
         return true;
 }