docs: fix usage for @koa/bodyparser v5 use const { bodyParser } = req…

[i5ting]

…uire("@koa/bodyparser")

const Koa = require("koa");
const { bodyParser } = require("@koa/bodyparser")

const app = new Koa();
app.use(bodyParser());

app.use((ctx) => {
  // the parsed body will store in ctx.request.body
  // if nothing was parsed, body will be an empty object {}
  ctx.body = ctx.request.body;
});

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