Fix migration script issue

Closes #1257

docs/docs/api/operationalerror.md

@@ -14,7 +14,7 @@ new OperationalError(String message) -> OperationalError
 ```
 
 
-Represents an error is an explicit promise rejection as opposed to a thrown error. For example, if an error is errbacked by a callback API promisified through undefined or undefined
+Represents an error is an explicit promise rejection as opposed to a thrown error. For example, if an error is errbacked by a callback API promisified through [`Promise.promisify`](.) or [`Promise.promisifyAll`](.)
 and is not a typed error, it will be converted to a `OperationalError` which has the original error in the `.cause` property.
 
 `OperationalError`s are caught in [`.error`](.) handlers.
@@ -32,4 +32,4 @@ and is not a typed error, it will be converted to a `OperationalError` which has
         (document.getElementsByTagName("head")[0] || document.getElementsByTagName("body")[0]).appendChild(dsq);
     })();
 </script>
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