HPCC-9930 Updated list of dependencies for installing from source

Alterations to sourcedoc.xml to include extra dependencies and
installation notes.

Fix missing <para>

Signed-off-by: jamienoss <james.noss@lexisnexis.com>
Merge pull request #4786 from jamienoss/issue9930

HPCC-9930 Updated list of dependencies for installing from source.

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>