fix(docs): update onGridStateServiceChanged to onGridStateChanged

[anton-gustafsson]

in migration to v2

- Event Emitter `(onGridStateServiceChanged)` renamed to `(onGridStateChanged)`

I got confused why the event did not work

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All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d058102) to head (c94091d).
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  Coverage   100.00%   100.00%           
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  Files            7         7           
  Lines         1027      1027           
  Branches       386       377    -9     
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  Hits          1027      1027           

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[ghiscoding]

oh wow thanks @anton-gustafsson, that must have been a while ago that I changed this event. Thanks for the update and as a side note, I added this All Available Events in the docs which can probably be helpful as well.