Align readme terminology with configuration terminology

[Dave-Casey]

Please check Services, Known Bug / Issues and Troubleshooting over here first: https://github.com/dahlb/ha_kia_hyundai/blob/master/README.md
Region and Brand of car

Describe the bug
Read me text states:
refresh - It will fetch the cached information every 30 minutes from Kia Servers. Now Configurable
request sync - It will ask your car for the latest data every 4 hours. Now Configurable
It will not force update between 6PM to 6AM. Now Configurable

But the configuration uses language like Scan and Sync.

Since it's so critical to avoid sync which could impact 12 V battery life, waking the car from deep sleep, it would be helpful to align terminology to make sure users are clearly setting the configuration with the desired outcomes.

Debug logs if an error occurred

Outlined here: https://github.com/dahlb/ha_kia_hyundai/blob/master/README.m

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Additional context
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