update course description

Author: brianamarie

course-details.md

@@ -1,32 +1,28 @@
-## Welcome to React!
+# Welcome to React
 
-Congratulations on taking some of your first steps into full stack development! 
+Congratulations on taking some of your first steps into full stack development.
 
 So why did you decide to click and join this course? Ideally, you are a learner who:
 
 - Understands HTML tags
 - Understands classes and methods in JavaScript
 - Understands Git and GitHub
 
-If you understand the topics above, you can start learning modern frontend development with React!
+If you understand the topics above, you can start learning modern frontend development with React.
 
 So why do we learn React?
 
-React has growing popularity in the tech industry because of its simplicity. With a simple knowledge of HTML and Javascript, picking up React shouldn't be too bad.
+React has growing popularity in the tech industry because of its simplicity. With a simple knowledge of HTML and JavaScript, picking up React shouldn't be too bad.
 
 ### What we will be building
 
-So what are we going to be building today? We are going to build a gradebook for teachers! Take a look at [our solution](https://githubtraining.github.io/react-solution/). Here's what the finished app looks like.
+So what are we going to be building today? We are going to build a gradebook for teachers! Take a look at [our solution](https://githubtraining.github.io/react-solution/) to see how the finished app looks.
 
-You will be able to add assignments
+You will be able to add assignments:
 ![Finished Assignments](https://user-images.githubusercontent.com/25253905/61293228-11f26580-a788-11e9-90ac-9612c2bddf6b.png)
 
-You will be able to add students
+You will be able to add students:
 ![Finished Students](https://user-images.githubusercontent.com/25253905/61293769-46b2ec80-a789-11e9-88b3-c660f436f5bf.png)
 
-
-You will be able to assign grades to those students for each assignment
+You will be able to assign grades to those students for each assignment:
 ![Finished Grades](https://user-images.githubusercontent.com/25253905/61295315-9810ab00-a78c-11e9-8bcb-f3e3bb87b2be.png)
-
-### Steps
-Go ahead and join the course!