Add introduction to iOS actions coming from CarPlay

[bgoncal]

Summary

Screenshots

Link to pull request in Documentation repository

Documentation: home-assistant/companion.home-assistant#

Any other notes

[codecov]

Codecov Report

Attention: 90 lines in your changes are missing coverage. Please review.

Comparison is base (ca0313d) 27.54% compared to head (914e3b8) 27.54%.

Files	Patch %	Lines
...cle/Templates/Actions/CarPlayActionsTemplate.swift	0.00%	34 Missing ⚠️
...es/App/Settings/SettingsDetailViewController.swift	0.00%	18 Missing ⚠️
...le/Templates/Actions/CarPlayActionsViewModel.swift	0.00%	17 Missing ⚠️
...ources/App/Notifications/NotificationManager.swift	0.00%	16 Missing ⚠️
Sources/App/Settings/SettingsRootDataSource.swift	0.00%	4 Missing ⚠️
Sources/App/Scenes/SettingsSceneDelegate.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2528   +/-   ##
=======================================
  Coverage   27.54%   27.54%           
=======================================
  Files         308      308           
  Lines       31419    31466   +47     
=======================================
+ Hits         8655     8668   +13     
- Misses      22764    22798   +34     

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