Update ConfigService.md

Fixes #46 and #44
Merge pull request #47 from g-ortuno/patch-3

Update ConfigService.md
Merge pull request #45 from g-ortuno/beacon-v2

Layout for V2
Update AdvertisedTxPowerLevel to ...Levels
Update links
Merge branch 'master' into read-v2-characteristics
Rename functions to respect spec.