docs: update node.js version supportPolicy table

[HonkingGoose]

Changes:

• Update table to reflect current official Node.js support table.
• Update current as of date to Oct 2020.

Context:

Can you please check my work, it was hard to figure out the Node.js versions that should go in each row of the table.

Closes #7497

Am I using the right conventional commit message?

I hope I'm using the right conventional commit message (I have never used conventional commits before...).

Feedback on first getting started contributing

I was a bit of work getting started, but it was well documented on how to get started with the work.
I ran all the tests by first installing everything with yarn install then made a basic build with yarn build, then ran yarn test, and finally confirmed that yarn start gives the correct error message.

[renovate-release]

🎉 This PR is included in version 23.53.1 🎉

The release is available on:

• GitHub release
• 23.53.1

Your semantic-release bot 📦🚀

[HonkingGoose]

Thanks for merging in my work! 😄 🎉

[viceice]

Thanks for your help. ❤️