Updated Required RCT2 files (markdown)

Required-RCT2-files.md

@@ -33,7 +33,7 @@ The method to retrieve the files varies, as it depends on your operating system
 * Existing install
 * Mini game (follow these instructions if you don't own RCT2)
 
-## Disk version
+### Disk version
 On Windows, the easiest way is to install RollerCoaster Tycoon 2 and simply point OpenRCT2 to the install directory. On Linux (and possibly macOS?), copy the file `data2.cab` from the CD to a place where you want to extract the files. Then you can use a tool called `unshield` like this:
 
 ```unshield -d extracted/ x data2.cab```