Update rails.md: Updated nodejs version to latest LTS.

[vzedano]

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Current document installs defauld nodejs version for debian, which is 4.x. If the doc is followed thoroughly, the rails app won't work because it's not compatible with node 4.x.

The aim of this PR is to install the latest LTS version of node (Currently 10.x) on the machine so the helloworld app in this tutorial is able to run.

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[GordonTheTurtle]

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[usha-mandya]

@ulyssessouza - Could you PTAL?

[vzedano]

Hi, is there any way to move this PR forward?

[usha-mandya]

Hey @devops-zedano - We'll review the content and update the PR as soon as possible. Thanks for your patience.

[vzedano]

Alright, sounds good. Thanks.

[usha-mandya]

@vzedano Thanks for the PR. The master branch has been renamed to main. Some of the existing PRs have been automatically closed as a result of this change. Could you create a new PR against our latest docs if the suggested changes are still relevant? Thank you.