doc: fix document of Error.captureStackTrace

After executing the below code, the first line of output is Error: myObject.message.

const myObject = {};
myObject.message = 'myObject.message';
myObject.toString = () => 'myObject.toString';
Error.captureStackTrace(myObject);
console.log(myObject.stack);

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

doc, errors