Document common LoRa devices

[nejraselimovic]

Summary

Closes #498

Notes for Reviewers

I checked datasheets for each one of these chips and found out that 90% of the info about chips from the same series is the same, so I aggregated the info to describe the whole series instead of chip by chip and just highlighted differences where they exist

Checklist

• [x] Scope: The referenced issue is addressed, there are no unrelated changes.
• [x] Run Locally: Verified that the docs build using make server, posted screenshots, verified external links.
• [x] Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• [ ] Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.

[jpmeijers]

I like how you summarised the families together.

In the opening paragraph you mention the LLCC68, but I don't see it being mentioned again in the content. Reading on the forum I see this is a stripped down sx126x. Maybe worth noting this down in this document, and mentioning the limitations and that it doesn't support all the datarates required for LoRaWAN. It can however still be used on a LoRaWAN network, but with shorter range. See: https://www.thethingsnetwork.org/forum/t/firing-up-the-new-llcc68-transceiver/39235