Update index.html.markdown (#435)

Author: vsinghal13

website/docs/index.html.markdown

@@ -155,8 +155,8 @@ The following properties are common to ALL sources and can be used to configure
        mask = "MaskedID"
      }
   ```  
-- `cutoff_timestamp` - (Optional) Only collect data more recent than this timestamp, specified as milliseconds since epoch (13 digit). 
-- `cutoff_relative_time` - (Optional) Can be specified instead of cutoffTimestamp to provide a relative offset with respect to the current time. Example: use -1h, -1d, or -1w to collect data that's less than one hour, one day, or one week old, respectively.
+- `cutoff_timestamp` - (Optional) Only collect data more recent than this timestamp, specified as milliseconds since epoch (13 digit). This maps to the `Collection should begin` field on the UI. Example: using `1663786159000` will set the cutoff timestamp to `Wednesday, September 21, 2022 6:49:19 PM GMT`
+- `cutoff_relative_time` - (Optional) Can be specified instead of cutoffTimestamp to provide a relative offset with respect to the current time.This maps to the `Collection should begin` field on the UI. Example: use -1h, -1d, or -1w to collect data that's less than one hour, one day, or one week old, respectively.
 - `fields` - (Optional) Map containing key/value pairs.
 
    Usage: