Fix tidy checks

src/libstd/sys/redox/process.rs

@@ -368,7 +368,7 @@ impl Command {
                     interpreter.pop().unwrap();
                 }
 
-                // TODO: Here we could just reassign `file` directly, if it
+                // FIXME: Here we could just reassign `file` directly, if it
                 // wasn't for lexical lifetimes. Remove the whole `let
                 // interpreter = { ... };` hack once NLL lands.
                 // NOTE: Although DO REMEMBER to make sure the interpreter path