This PR contains all files added to /beats/journalbeat/docs for 6.5. It does not include files from beats/libbeat/docs. The beats-docs-review repository is intended for review purposes only. You will not be able to build/test the files in this repo.

Please review the proposed additions and add your comments to this PR. After we're through reviewing/updating the files in /beats/journalbeat/docs, you'll have an opportunity to do a final review of all the files (including the files from libbeat) in the Beats repo.

You can preview the docs here: https://journalbeat-62556.firebaseapp.com/index.html

Here's a list of open issues that you can help me resolve. Please identify anything else that is missing:

• Verify package names in the installation topic (they were missing from BC1).
• Check to see if apt/yum repos will be available. If not, remove the note.
• Verify that seek: cursor is the default.
• Determine whether we want to recommend using sudo in the install topic.
• Defer: Improve descriptions of backoff_factor and and max_backoff. Looked at the descritpions for Filebeat, but TBH I couldn't follow them very well.

Note that I plan to do the following work in separate PRs:

• Update the command reference (I'm also updating it for Functionbeat)
• Add linux command examples to the shared files.

When this review is closed, go to elastic/beats#8864 to complete the final review.