In https://github.com/scylladb/scylla-docs/pull/3105 it was noted that the Sphynx document parser doesn't like a horizontal line ("---") in the beginning of a section. Since there is no real reason why we must have this horizontal line, let's just remove it. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20201001151312.261825-1-nyh@scylladb.com>