vlc/sandbox: fix caps on openfilemapping and mapviewoffile

vlc_sandbox.md

@@ -223,7 +223,7 @@ present in the command line.
 [ ] `block_alloc` should create a file mapping using `createfilemapping` and map
 it in memory using `mapviewoffile`.
 
-[ ] `block_filemapping_init` should use `openfilemapping` and `mapviewoffile`.
+[ ] `block_filemapping_init` should use `OpenFileMapping` and `MapViewOfFile`.
 
 [ ] `msg_poller` should use io completion port
 => might work, try out