Update Cylindrical_Coordinates.md - wording fix

doc/docs/Python_Tutorials/Cylindrical_Coordinates.md

@@ -617,7 +617,7 @@ print(scatt_power_m)
 
 The resulting `scatt_power_m` array is a table where each row `scatt_power_m[j,:]` corresponds to one angle, and
 the columns `scatt_power_m[j,M]` is the sum of power contributions for `|m| ≤ M`.  For `M` sufficiently large,
-these sums become the same, because the scattering from a sphere is angle independent.  For `M=5` are slight (≈2%)
+these sums approach the same value, because the scattering from a sphere is angle independent.  For `M=5` there are slight (≈2%)
 discrepancies between angles due to primarily discretization errors (doubling the resolution more than halves this
 error).