unit: fix typo
@@ -332,7 +332,7 @@ func (u *Unit) SetValue(v float64) {
}
// Format makes Unit satisfy the fmt.Formatter interface. The unit is formatted
-// with dimensions appended. If the power if the dimension is not zero or one,
+// with dimensions appended. If the power of the dimension is not zero or one,
// symbol^power is appended, if the power is one, just the symbol is appended
// and if the power is zero, nothing is appended. Dimensions are appended
// in order by symbol name with positive powers ahead of negative powers.
