Remove "directly"

Author: xanni

exercises/square-root/introduction.md

@@ -7,4 +7,4 @@ As the first step in our calculation, we take a target number and find its squar
 The journey will be very long.
 To make the batteries last as long as possible, we had to make our rocket's onboard computer very power efficient.
 Unfortunately that means that we can't rely on fancy math libraries and functions, as they use more power.
-Instead we want to calculate the square root directly.
+Instead we want to implement our own square root calculation.