content: explain when you want to store return values in lesson 22

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-text = "Notice how we assign the result of the function call to a variable. Because the [code]round()[/code] function returns a [i]new[/i] value, we need to store the result.
+text = "Notice how we assign the result of the function call to a variable. Because the [code]round()[/code] function returns a [i]new[/i] value, we need to either store the result or use the value immediately.
 
-So we assign the result to a variable."
+Above, we assigned it to a variable, but you could also do the following."
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+text = "You can assign the return value of a function call if you plan on using it more than once."
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