[course text] Replace class declaration with class definition
which is the correct word to use.
[course text] Section 6 - Add instruction to look in
Console tab to see that build went fine. Add
explanation that first time we run the tests we
have 0 tests in place.
[course text]
Section 15 - Add hint to look in build folder after wordsrepapp
binary after building
Section 16 - Remind students to both add and commit files
in Git before setting up Jenkins job