core/hle/result: Amend error in comment description for ResultCode

Gets rid of another holdover from Citra, and describes the OS on the
Switch instead.

src/core/hle/result.h

@@ -112,7 +112,7 @@ enum class ErrorModule : u32 {
     ShopN = 811,
 };
 
-/// Encapsulates a CTR-OS error code, allowing it to be separated into its constituent fields.
+/// Encapsulates a Horizon OS error code, allowing it to be separated into its constituent fields.
 union ResultCode {
     u32 raw;