Improve docs with reference

Author: craigfowler

CSF.Extensions.WebDriver.Docs/docs/index.md

@@ -71,6 +71,13 @@ Do not forget that you may provide configuration from multiple sources; for exam
 
 [`GetDefaultWebDriver()`]: xref:CSF.Extensions.WebDriver.IGetsWebDriver.GetDefaultWebDriver(System.Action{OpenQA.Selenium.DriverOptions})
 
+### Configuration reference
+
+The available configuration options/syntax is documented in the classes [`WebDriverCreationOptionsCollection`] and [`WebDriverCreationOptions`].
+
+[`WebDriverCreationOptionsCollection`]: xref:CSF.Extensions.WebDriver.Factories.WebDriverCreationOptionsCollection
+[`WebDriverCreationOptions`]: xref:CSF.Extensions.WebDriver.Factories.WebDriverCreationOptions
+
 ## 3. Inject and use the services
 
 Use dependency injection to inject an [`IGetsWebDriver`].