Update 01-introduction.md
Update 02-maintenance.md
Update 04-content.md
Update 06-main_functions.md
Update 07-bluetooth_pairing.md
Update 08-play_control.md
Update 09-talk_control.md
Update 12-declaration_of_conformity.md
Merge pull request #21 from energysistem/modificacioninglesbtsport

Modificacioninglesbtsport