docs: add note on global npm installs, change OpenJDK URL

[ericzbeard]

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[shivlaks]

@ericzbeard - one small note, I think we try to keep commit messages all lowercase (unless referencing a service or entity that needs capitalization) as mentioned in the pull request checklist

I've updated your title to drop the capitalization on Add

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• CodeBuild project: AutoBuildProject6AEA49D1-qxepHUsryhcu
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Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).