Wrong URL to IFTTT website

[csarnataro]

In page https://docs.arduino.cc/arduino-cloud/features/webhooks the URL to the IFTTT site is wrong.

Check the link 1. Go to IFTTT website and sign in.

The issue is caused by a wrong link in the underlying Markdown file:
https://github.com/arduino/docs-content/blob/main/content/arduino-cloud/02.features/06.webhooks/iot-cloud-webhooks.md?plain=1#L56

Wrong link: [IFTTT website](maker.ifttt.com)

Fixed link: [IFTTT website](https://maker.ifttt.com)
The link should contain the protocol https://.

I will open a PR to fix this issue in the next few minutes.

[csarnataro]

Closed in #712