Move config key explinations to a table

Author: mattbrailsford

15/umbraco-commerce/how-to-guides/configuring-cart-cleanup.md

@@ -20,12 +20,11 @@ This service can be enabled and configured in the `appSettings.json`
             "CartCleanupPolicy": {
                 "EnableCleanup": true,
                 "KeepCartsForDays": 800,
-                // Below settings are optional
-                "FirstRunTime": string; the time to first run the scheduled cleanup task, in crontab format
-                "Period": string; how often to run the task, in timespan format
-                // Configure diffrent policies per store
+                // Optional settings
+                "FirstRunTime": "* 4 * * *",
+                "Period": "1.00:00:00",
                 "PerStorePolicies": {
-                    "StoreAlias": {
+                    "{STORE_ALIAS}": {
                         "KeepCartsForDays": 800,
                     }
                 }
@@ -35,6 +34,17 @@ This service can be enabled and configured in the `appSettings.json`
 }
 ```
 
+The configuration supports the followin keys.
+
+| Key | Description |
+| -- | -- |
+| `EnableCleanup` | Enables or disabled the cart cleanup service. `false` by default. |
+| `KeepCartsForDays` | The number of days to keep carts after the carts last modification date. |
+| `FirstRunTime` | The time to first run the scheduled cleanup task, in crontab format. If empty, runs imediately on app startup. |
+| `Period` | How often to run the task, in timespan format. Defaults to every 24 hours. |
+| `PerStorePolicies` | Define store specific policies. | 
+| `PerStorePolicies.{STORE_ALAIS}.KeepCartsForDays` | The number of days to keep carts after the carts last modification date for the given store. | 
+
 ## Cart Conversion Rates Widget
 
 When enabling the cart cleanup service, it's important to know that this can affect the cart conversion rates widget in the analytics section. If the widget is configured to show a time period that exceeds the cleanup policies time frame then a warning will be displayed.