[modbus] Minor text updates (#4828)
[modbus] Minor text updates (#4828)

* [Modbus] minor text updates

A few small corrections and improvements.

* Update README.md

I did not realise the addressing part was a direct quote, reversed changes which were very minor.

theoweiss/openhab2,theoweiss/openhab2,gerrieg/openhab2,Snickermicker/openhab2,clinique/openhab2,digitaldan/openhab2,Snickermicker/openhab2,theoweiss/openhab2,Snickermicker/openhab2,digitaldan/openhab2,Snickermicker/openhab2,gerrieg/openhab2,clinique/openhab2,gerrieg/openhab2,digitaldan/openhab2,clinique/openhab2,clinique/openhab2,gerrieg/openhab2,theoweiss/openhab2,digitaldan/openhab2