Say why, not what went wrong

A backend can be unshipped for a performance reason with nothing having
failed, which is the RF-DETR keypoint case.

MODEL_CARD.md

@@ -80,14 +80,14 @@ second answer here would only compete with it.
 ### 3. Unshipped backends
 
 Omitted unless the repository has one. A backend directory carrying a
-`NOTES.md` and no `.pte` was exported and not published; the note records what
-went wrong, and the card links it rather than repeating it.
+`NOTES.md` and no `.pte` was exported and not published; the note records why,
+and the card links it rather than repeating it.
 
 ```markdown
 ## Unshipped backends
 
 A backend directory carrying a `NOTES.md` and no `.pte` was exported and
-not published. Its note records what went wrong.
+not published. Its note records why.
 
 - `coreml` ([why](https://huggingface.co/software-mansion/<repo>/blob/main/coreml/NOTES.md))
 ```