Doc: minor improvement in pl/pgsql FETCH/MOVE documentation.

Explain that you can use any integer expression for the "count" in
pl/pgsql's versions of FETCH/MOVE, unlike the SQL versions which only
allow a constant.

Remove the duplicate version of this para under MOVE.  I don't see
a good reason to maintain two identical paras when we just said that
MOVE works exactly like FETCH.

Per Pavel Stehule, though I didn't use his text.




Modified Files
doc/src/sgml/plpgsql.sgml   | 24 ++++--------------------
doc/src/sgml/ref/fetch.sgml |  2 +-
2 files changed, 5 insertions(+), 21 deletions(-)

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