pgsql: Improve SPI documentation about null-flags arrays.

Improve SPI documentation about null-flags arrays.

Clarify the description of nulls[] arguments, and use the same wording
for all SPI functions with this type of argument. Per gripe from Yuriy
Rusinov.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/c091c431979c182bc835b345655c1c162479aeb3

Modified Files
--------------
doc/src/sgml/spi.sgml | 105 +++++++++++++++++++++++++++++++++----------------
1 files changed, 71 insertions(+), 34 deletions(-)

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