Rename Entity suffix to EntityBehavior in example app

[jchapuis]

No description provided.

[codecov]

Codecov Report

Merging #292 (a79872c) into master (f9f41be) will not change coverage.
Report is 5 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #292   +/-   ##
=======================================
  Coverage   89.90%   89.90%           
=======================================
  Files          72       72           
  Lines         872      872           
  Branches       98       98           
=======================================
  Hits          784      784           
  Misses         88       88           

Files	Coverage Δ
.../main/scala/endless/example/app/akka/AkkaApp.scala	100.00% <100.00%> (ø)
...ain/scala/endless/example/app/pekko/PekkoApp.scala	100.00% <100.00%> (ø)
.../endless/example/logic/BookingEntityBehavior.scala	90.90% <ø> (ø)
.../endless/example/logic/VehicleEntityBehavior.scala	100.00% <ø> (ø)