docs/configuration: reword intro to dictionary-type settings
docs/configuration: reword intro to dictionary-type settings

Use 'keys' instead of 'settings'.

Ryati/satchmo,ringemup/satchmo,twidi/satchmo,ringemup/satchmo,Ryati/satchmo,dokterbob/satchmo,dokterbob/satchmo,twidi/satchmo