doc: fix minor typo in n-api.md

Correct parameter name for `napi_is_error` description.

PR-URL: #23310
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/n-api.md

@@ -571,7 +571,7 @@ NAPI_EXTERN napi_status napi_is_error(napi_env env,
                                       bool* result);
 ```
 - `[in] env`: The environment that the API is invoked under.
-- `[in] msg`: The `napi_value` to be checked.
+- `[in] value`: The `napi_value` to be checked.
 - `[out] result`: Boolean value that is set to true if `napi_value` represents
 an error, false otherwise.