doc: improve example for Error.captureStackTrace()

doc/api/errors.md

@@ -232,14 +232,27 @@ The `constructorOpt` argument is useful for hiding implementation
 details of error generation from the user. For instance:
 
 ```js
-function MyError() {
-  Error.captureStackTrace(this, MyError);
+function a() {
+  b();
 }
 
-// Without passing MyError to captureStackTrace, the MyError
-// frame would show up in the .stack property. By passing
-// the constructor, we omit that frame, and retain all frames below it.
-new MyError().stack;
+function b() {
+  c();
+}
+
+function c() {
+  // Create an error without stack trace to avoid calculating the stack trace twice.
+  const { stackTraceLimit } = Error;
+  Error.stackTraceLimit = 0;
+  const error = new Error();
+  Error.stackTraceLimit = stackTraceLimit;
+
+  // Capture the stack trace above function b
+  Error.captureStackTrace(error, b); // Neither function c, nor b is included in the stack trace
+  throw error;
+}
+
+a();
 ```
 
 ### `Error.stackTraceLimit`