doc: Fix typos and external links, add new info

TheThingsNetwork / docs

Documentation for The Things Network

https://www.thethingsnetwork.org/docs/

Apache License 2.0

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Closed nejraselimovic closed 3 years ago

nejraselimovic commented 3 years ago

This PR contains updates of TTN Learn documentation that cover the feedback submitted by @pradeeka7.

Closing: #439, #438, #437, #436, #435