update acc lesson

docs/lessons/charting/acceleration-challenge.md

@@ -90,6 +90,7 @@ Have fun reviewing your simulation and analyze the acceleration by chart the Exc
 * Connect the second micro:bit to your computer using your USB cable and run the charting script on it.
 * The first person and second person take turns tilting the micro:bit in the "x" direction while the other player charts the data on the micro:bit!
 * Review and analyze the actual micro:bit device acceleration data on Excel
+* Display acceleration with y or z using plot bar graph by changing acceleration from "x" to "y" or "z" 
 
 
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docs/lessons/charting/acceleration.md

@@ -76,6 +76,7 @@ Tip: If you don’t see a chart type that you want, click the All Charts tab to
 
 * Connect a micro:bit to your computer using your USB cable; compile; and repeat this experiment by moving the micro:bit in the "x" direction. Then collect and chart the data on Excel. 
 * Review and analyze the actual micro:bit device data on Excel
+* Display acceleration with y or z using plot bar graph by changing acceleration from "x" to "y" or "z" 
 
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