Update documentation of control key on science

Signed-off-by: Stephen M. Cameron <stephenmcameron@gmail.com>

snis_client.c

@@ -17094,12 +17094,13 @@ static char *help_text[] = {
 	"    F6: SCIENCE F7: COMMS F8: MAIN SCREEN F9: DEMON SCREEN\n\n"
 	"  * USE MOUSE WHEEL TO ZOOM/UNZOOM\n"
 	"  * USE LEFT/RIGHT ARROWS TO ROTATE SCANNING BEAM (USE CTRL FOR FINE ADJUSTMENT)\n"
-	"  * USE UP/DOWN ARROWS TO FOCUS/WIDEN SCANNING BEAM\n"
+	"  * USE UP/DOWN ARROWS TO FOCUS/WIDEN SCANNING BEAM (USE CTRL FOR FINE ADJUSTMENT)\n"
 	"  * SELECT TARGETS WITH MOUSE TO EXAMINE\n"
 	"    USE DETAILS BUTTON FOR MORE INFO\n"
 	"  * LRS LONG RANGE SCANNER\n"
 	"       * PRESS AND HOLD RIGHT MOUSE BUTTON WITHIN VIEWSCREEN TO ROTATE VIEW\n"
 	"       * OR USE COMMA, PERIOD, SLASH, L-KEY, K-KEY, SEMICOLON TO ROTATE VIEW\n"
+	"       * USE CTRL KEY FOR FINE ADJUSTMENT\n"
 	"  * SRS SHORT RANGE SCANNER\n"
 	"  * MINING ROBOT\n"
 	"       SELECT AN ASTEROID OR DERELICT SHIP THEN LAUNCH THE MINING ROBOT\n"