Fix invalid command line in the README of transfer-00-prerequisites

[iwasakims]

Bug Report

Describe the Bug

In the command line of README of transfer-00-prerequisites, extra | before -s causes error on copying from browser and pasting.

$ curl -H 'Content-Type: application/json' \
     -d @transfer/transfer-00-prerequisites/resources/dataplane/register-data-plane-provider.json \
     -X POST "http://localhost:19193/management/v2/dataplanes" | -s | jq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (7) Failed to connect to localhost port 19193 after 0 ms: Connection refused
-s: command not found

Possible Implementation

Just removing the extra |.

[github-actions]

Thanks for your contribution 🔥 We will take a look asap 🚀