doc: Added note to change RX1 Delay in configure-mac-settings#12

ymgupta wants to merge 2 commits into

doc/migration-mac-settingCyberEyeResearchLabs/lorawan-stack-docs:doc/migration-mac-settingfrom

doc/migration-mac-setting-devCyberEyeResearchLabs/lorawan-stack-docs:doc/migration-mac-setting-devCopy head branch name to clipboard