doc: Expand recursive query documentation

Break the section up with subsection headings.  Add examples for depth-
and breadth-first search ordering.  For consistency with the SQL
search clause, start the depth counting at 0 instead of 1 in the
examples.

Discussion: 
https://www.postgresql.org/message-id/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/323ae003e464cac35f86790f3708b383c18df9e2

Modified Files
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doc/src/sgml/queries.sgml | 163 ++++++++++++++++++++++++++++++++++++++++------
1 file changed, 142 insertions(+), 21 deletions(-)

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