doc: Fix SQL keywords lists

Some keywords were listed as both reserved and nonreserved.  Fix as
appropriate.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/7ba09efe248fe5e15bd6d4c4d0612ea63b66a860

Modified Files
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doc/src/sgml/keywords/sql2016-02-reserved.txt | 3 ---
1 file changed, 3 deletions(-)

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