Retry mechanism documentation case

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In the document case, some minor problems were found;

It is easy to cause ambiguity here. It is recommended to use other function names instead and improve the cases.
like this:

import { retryWithAsync } from '@midwayjs/core';

async function foo(val: number) {

  // TODO: asynchronous operations

}

async function invoke() {
  // 默认调用，加上重试两次，最多执行三次
  const invokeNew = retryWithAsync(foo, 2);

  try {
    return await invokeNew(1);
  } catch(err) {

    // err
  }
}

The above only represents my personal opinion. If there are any errors, please let me know. Thank you.

[czy88840616]

LGTM

[czy88840616]

has been updated