chore(docs): Update version numbers in tutorial (#22291)
chore(docs): Update version numbers in tutorial (#22291)

* chore(docs): Update version numbers

The documentation in tutorial does not use the latest version number of nvm and node, but it says that it is the latest version.

* Update index.md

* Revert every change except on line 155

* Correct mistakes
gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby