Merge pull request #730 from ljhwang/patch-47

Update 19_spherical_models.md

doc/sphinx/user_manual/basic_starter_tutorial/19_spherical_models.md

@@ -4,12 +4,12 @@ Spherical models
 
 We have already mentioned spherical coordinates in {ref}`part:user_manual:chap:basic_starter_tutorial:sec:03_coordinate_system`. In this section we will focus on converting our current Cartesian model to a spherical model. 
 
-To make this change two changes need to be made:
+To convert, two changes need to be made:
 
 1. The coordinate system should be set to spherical and a depth method needs to be set.
 2. The coordinates you provide need to be changed from Cartesian to spherical.
 
-To simplify the transition for this tutorial, we will just divide each coordinate by 10000, which will get is into a nice degree range.
+To simplify the transition for this tutorial, we will just divide each coordinate by 10000 which will put this into a nice degree range.
 
 ::::::{tab-set}
 
@@ -67,4 +67,4 @@ To simplify the transition for this tutorial, we will just divide each coordinat
 :align: center
 
 Basic Starter Tutorial section 19 high resolution result. This has 8 times the resolution than the grid file above. Note that you can see the Earth's curvature! 
-```
+```