Auto merge of #12068 - Bhardwaj-Himanshu:#12056, r=weihanglo

docs(registry): Further specify owner-remove response (#12056)

### What does this PR try to resolve?

This fixes a documentation issue as mentioned in #12056.

### How should we test and review this PR?

This is just a markdown file change, so it does not break anything.

### Additional information

Let me know if you have any changes or suggestions or how to write the tests for markdown files as well!

Thanks

src/doc/src/reference/registry-web-api.md

@@ -308,6 +308,8 @@ A successful response includes the JSON object:
 {
     // Indicates the remove succeeded, always true.
     "ok": true
+    // A string to be displayed to the user. Currently ignored by cargo.
+    "msg": "owners successfully removed",
 }
 ```