51d: update RtdProvider doc

dev-docs/modules/51DegreesRtdProvider.md

@@ -51,7 +51,7 @@ gulp build --modules="rtdModule,51DegreesRtdProvider,appnexusBidAdapter,..."
 
 #### Resource Key
 
-In order to use the module please first obtain a Resource Key using the [Configurator tool](https://configure.51degrees.com/tWrhNfY6) - choose the following properties:
+In order to use the module please first obtain a Resource Key using the [Configurator tool](https://configure.51degrees.com/HNZ75HT1) - choose the following properties:
 
 * DeviceId
 * DeviceType
@@ -62,11 +62,13 @@ In order to use the module please first obtain a Resource Key using the [Configu
 * PlatformVersion
 * ScreenPixelsHeight
 * ScreenPixelsWidth
+* ScreenPixelsPhysicalHeight
+* ScreenPixelsPhysicalWidth
 * ScreenInchesHeight
 * ScreenInchesWidth
-* PixelRatio (optional)
+* PixelRatio
 
-PixelRatio is desirable, but it's a paid property requiring a paid license. Free API service is limited. Please check [51Degrees pricing](https://51degrees.com/pricing) to choose a plan that suits your needs.
+The API is free to integrate and use. However the free tier has certain limitations. Please check [51Degrees pricing](https://51degrees.com/pricing) to choose a plan that suits your needs.
 
 #### User Agent Client Hint (UA-CH) Permissions
 
@@ -106,13 +108,13 @@ In summary we recommend using `Delegate-CH` http-equiv as the preferred method o
 
 ### Configuration
 
-This module is configured as part of the `realTimeData.dataProviders`
+This module is configured as part of the `realTimeData.dataProviders`.  We recommend setting `auctionDelay` to at least 250 ms and make sure `waitForIt` is set to `true` for the `51Degrees` RTD provider.
 
 ```javascript
 pbjs.setConfig({
     debug: true, // we recommend turning this on for testing as it adds more logging
     realTimeData: {
-        auctionDelay: 1000, // should be set lower in production use
+        auctionDelay: 250,
         dataProviders: [
             {
                 name: '51Degrees',