doc:  in contrib-spi, mention and link to the meaning of SPI

Also remove outdated comment about SPI subtransactions.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.3

Branch
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REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/12db49a83058d8e9269b405d9fe17ea662623e80

Modified Files
--------------
doc/src/sgml/contrib-spi.sgml | 4 +++-
doc/src/sgml/spi.sgml         | 3 +--
2 files changed, 4 insertions(+), 3 deletions(-)

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