Add another SELinux boolean to the docs

Review Request #9859 — Created April 6, 2018 and submitted — Latest diff uploaded

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Review Board
master
c27ceb9...

Reviewers

Without the httpd_can_network_connect boolean enabled, creation of
a new repository with a hosting provider will fail because it needs
to establish a connection to authenticate and retrieve a token.

Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>

I discovered the need for this option while testing my Fedora packages for ReviewBoard 3.0.5.