message: docs: replace hardcoded authentication info with environment variables
diff: @@ -16,9 +16,12 @@ const { KintoneRestAPIClient } = require("@kintone/rest-api-client");
  const client = new KintoneRestAPIClient({
  baseUrl: "https://example.cybozu.com",
  // Use password authentication
  - auth: { username: "username", password: "password" }
  + auth: {
  + username: process.env.KINTONE_USERNAME,
  + password: process.env.KINTONE_PASSWORD
  + }
  // Use API Token authentication
  - // auth: { apiToken: "API_TOKEN" }
  + // auth: { apiToken: process.env.KINTONE_API_TOKEN }
  // Use session authentication if `auth` is omitted (in browser only)
  });
  