Fix some typos in tutorial1

[ghp-dev]

The tutorial under https://github.com/docToolchain/docs-as-co.de/blob/master/docs/_pages/getstarted/ contains some minor issues. E.g.

• typo

  mkdir tutorial1 
  cd tutorial

  the last command is missing a '1'

• file overwrite gradle initproduces a nice settings.gradle file (in folder tutorial1). The next command echo "include 'docToolchain'" > settings.gradle overwrites it's content with the one-liner. append the 'include' statement with >>

• runtime errors due to uncommented line numbers

[rdmueller]

great that you ooened this detailed issue! For me it would also have been ok if it would have been only the PR.

If the problem is more complex, having a detailed issue gets more important.

thanx for your effort and contributiin!