Update tutorials.rst

Change some wording
Update table_of_content_introduction.rst
ability to compile for iOS with Neon
Merge pull request #3335 from ilya-lavrenov:neon_ios
Merge pull request #3333 from micha137:patch-1
Merge pull request #3334 from micha137:patch-2
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  ability to compile for iOS with Neon
  Update table_of_content_introduction.rst
  Update tutorials.rst