updated lessons

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docs/lessons/charting/acceleration-challenge.md

@@ -92,9 +92,3 @@ Have fun reviewing your simulation and analyze the acceleration by chart the Exc
 * 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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-Excellent, you're ready to continue with the [challenges](/lessons/charting/acceleration)
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docs/lessons/charting/acceleration.md

@@ -39,7 +39,7 @@ Vigorously move the micro:bit in the micro:bit simulatator by moving the micro:b
 
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-Review and write down your observations from the Excel data. Then chart or graph the data collected by using a tool in Excel. 
+We want to chart the data collected by using a tool in Excel. 
 
 The final part of this experiment is opening and reviewing the data in the Excel CSV file. Simply click on the line beneath the simulator. A CSV file will be generated to display the data points collected by moving the micro:bit in the X direction. Then click or tap on the data Excel file that was downloaded to your local Downloads Folder. 
 
@@ -55,7 +55,6 @@ Use the Recommended Charts command on the Insert tab to quickly create a chart t
 
 * Select the data that you want to include in your chart.
 
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 * Click Insert > Recommended Charts.
 
 ![](/static/mb/chart1.png)