change heroku repository code example

Example 1: heroku and github on termi

$ heroku git:remote -a thawing-inlet-61413
set git remote heroku to https://git.heroku.com/thawing-inlet-61413.git

Example 2: heroku and github on termi

$ git push heroku master
Initializing repository, done.
updating 'refs/heads/master'
...

Example 3: heroku and github on termi

$ git remote rename heroku heroku-staging

Example 4: set git remote heroku to https://git.heroku.com/resume-projects.git

$ git push heroku testbranch:master

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