Update Write Your First Application Tutorial

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

Remove reference to FabCar

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

Fix typo, address comments

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

Update to address requested reviewer changes

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>

Fix case and grammatical errors

Signed-off-by: Chris Gabriel <chris_gabriel_98@yahoo.com>