pgsql: Remove obsolete comment.

Remove obsolete comment.

Obsoleted by commit 21dcda2713656a7483e3280ac9d2ada20a87a9a9, but I missed
seeing the cross-reference in the comments for exec_eval_integer().

Also improve the cross-reference in the comments for exec_eval_cleanup().

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5ff683962ef9a953eeb17ea58d678f0c4ca189ae

Modified Files
--------------
src/pl/plpgsql/src/pl_exec.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

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