Update Bin2Dec-App.md

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Line 10: used before plural of string

Projects/1-Beginner/Bin2Dec-App.md

@@ -5,9 +5,9 @@
 Binary is the number system all digital computers are based on.
 Therefore it's important for developers to understand binary, or base 2,
 mathematics. The purpose of Bin2Dec is to provide practice and
-understanding of how binary calculations.
+understanding of how binary calculations are done.
 
-Bin2Dec allows the user to enter strings of up to 8 binary digits, 0's
+Bin2Dec allows the user to enter string of up to 8 binary digits, 0's
 and 1's, in any sequence and then displays its decimal equivalent.
 
 This challenge requires that the developer implementing it follow these