Update the manual to use EL7 commands in place of EL6

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1

As you no longer support EL6 is it time to update the manual with the EL7 versions of the commands.
Also it may help to add

# systemctl stop puppetserver
# systemctl stop httpd

As part of the update commands.
But I am still working my up to a more recent version of Foreman.
I think this applies to all version since 1.12.

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Thank you for the feedback!
The manual lives on github - pull requests are appreciated :wink: