Update device_service.adoc: corrected title & added services

[sjjh]

Corrected title from "Controller" to "Device and Service". In introduction section added "services" in addition to "devices" as description.

[sjjh]

Only a small documentation fix, hopefully trivial to merge. :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3489      +/-   ##
=============================================
+ Coverage      59.75%   59.76%   +0.01%     
  Complexity       105      105              
=============================================
  Files           2951     2951              
  Lines         127746   127746              
  Branches        9552     9552              
=============================================
+ Hits           76324    76330       +6     
+ Misses         48523    48513      -10     
- Partials        2899     2903       +4     

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