Make INSTALL-cloud agree with discourse-setup (PR #8102)

discourse-setup will install Docker. Several people lately have had trouble with a | getting turned into a > when trying to curl the site into sh.

Also, the recommended git clone command will create /var/discourse, so don’t tell people to make that directory, as that too can be confusing.

GitHub

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I don’t see a need for this change?

oh wait LOL I see that discourse-setup was changed. my bad.

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