[tesla] Clarify and update how refresh tokens can be obtained (#12015)

* Clarify and update how refresh tokens can be obtained
* Fix logging statement

Signed-off-by: Kai Kreuzer <kai@openhab.org>

bundles/org.openhab.binding.tesla/README.md

@@ -27,7 +27,10 @@ Furthermore, once an account is configured, it is automatically queried for asso
 
 The `account` bridge requires an OAuth2 refresh token as the only parameter `refreshToken`.
 
-There are two different ways of obtaining the token:
+There are three different ways of obtaining the token.
+
+NOTE: Tesla has introduced some captcha mechanism, which might prevent options 1 and 2 from working as expected.
+In case you are only receiving error messages, please make use of option 3!
 
 1. Use the openHAB console
 
@@ -50,6 +53,18 @@ If you do not want to use the openHAB console, you can also manually create a "T
 
 openHAB will use the provided credentials to retrieve and set the refresh token and automatically delete your password from the configuration afterwards for safety reasons.
 
+3. Use external tools
+
+There are a few 3rd party tools available that have specialized on getting hold of refresh tokens for the Tesla API.
+Please note that we in general consider it dangerous to enter your credentials into some 3rd party app - you will have to trust the author not to send or store those credentials anywhere.
+
+- [Tesla Access Token Generator (Chromium Extension](https://github.com/DoctorMcKay/chromium-tesla-token-generator)
+- [Auth App for Tesla (iOS)](https://apps.apple.com/us/app/auth-app-for-tesla/id1552058613)
+- [Tesla Tokens (Android)](https://play.google.com/store/apps/details?id=net.leveugle.teslatokens)
+
+When using one of such apps, simply copy and paste the received refresh token into the account configuration.
+
+
 ## Thing Configuration
 
 The vehicle Thing requires the vehicle's VIN as a configuration parameter `vin`.