Update README.md

Control/CalypsoExample/GeoModelTest/README.md

-This example package actually serves several purposes:
+This example package serves several purposes:
 
 
 *  It illustrates how to initialize and access the detector description and magnetic field.
@@ -9,7 +9,7 @@ This example package actually serves several purposes:
 
 *  It dumps a standalone GeoModel sqlite geometry database which could be used by external programs to display FASER without requiring any FASER software (only GeoModel)
 
-To run the algorithm, in a run directory where Calypso has been installed, do
+To run the algorithm, in a run directory where Calypso has been installed (displayed below as the command-line prompt `run >`), do
 
 ```
 run > ./setup.sh