Satellite Tracker Settings: add missing help description of Replay tab

plugins/feature/satellitetracker/readme.md

@@ -111,7 +111,7 @@ To use a TLE file on a local disk, use a URL such as file:my_tle.txt
 
 ![Satellite tracker settings dialog](../../../doc/img/SatelliteTracker_plugin_settingsdialog3.png)
 
-On the display tab, you can set:
+On the Display tab, you can set:
 
 * The update period in seconds, which controls how frequently satellite positions are calculated.
 * The default frequency in MHz that is used for calculating Doppler and free space path loss in the Satellite Data table.
@@ -123,6 +123,13 @@ only be displayed if the source in the Rotator Controller is set to this Satelli
 * Whether times are displayed in the local time zone or UTC.
 * Whether to draw the satellites on the map.
 
+![Satellite tracker settings dialog](../../../doc/img/SatelliteTracker_plugin_settingsdialog4.png)
+
+On the Replay tab, you can set what happens when the start button is pressed:
+* Whether to replay a satellite pass in the past.
+* The start date and time of the replay.
+* Whether to also send the replayed date and time to the Map feature.
+
 <h3>9: Latitude</h3>
 
 Specifies the latitude in decimal degrees (North positive) of the antenna location.