Fix a doctest

fhammerschmidt · fhammerschmidt · commit bd372ebc628a · 2024-04-03T22:35:42.000+02:00
diff --git a/src/Core__BigInt.res b/src/Core__BigInt.res
@@ -30,7 +30,7 @@ BigInt.fromStringExn("0o11")
 try {
   BigInt.fromStringExn("a")
 } catch {
-| _ => ...
+| Exn.Error(_error) => 0n
 }
 ```
 */
