uutests: fix the doc

tests/tests.rs

@@ -3,7 +3,6 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-// Then override the macro with your constant
 use std::env;
 
 pub const TESTS_BINARY: &str = env!("CARGO_BIN_EXE_coreutils");
@@ -12,6 +11,7 @@ pub const TESTS_BINARY: &str = env!("CARGO_BIN_EXE_coreutils");
 #[ctor::ctor]
 fn init() {
     unsafe {
+        // Necessary for uutests to be able to find the binary
         std::env::set_var("UUTESTS_BINARY_PATH", TESTS_BINARY);
     }
 }