update readme and docs

README.md

-# webprog2022-courses
+# Part 2 Courses
 
+React-app Courses contains excercises 1-3 from UTU Web and mobile programming course part 2.
\ No newline at end of file

courses/README.md

-# Part 1 Courses
+# Part 2 Courses
 
-This React-app contains excercises 1-5 from UTU Web and mobile programming course part 1.
+This React-app contains excercises 1-3 from UTU Web and mobile programming course part 2.

courses/src/components/Course.js

@@ -3,6 +3,7 @@ import Contents from './Contents'
 import Header from './Header'
 import Total from './Total'
 
+/** Renders course contents: Header, contents, total */
 const Course = (props) => {
     return(
         <div>