pgsql: Fix inconsistency in comments atop ExecParallelEstimate.

Fix inconsistency in comments atop ExecParallelEstimate.

When this code was initially introduced in commit d1b7c1ff, the structure
used was SharedPlanStateInstrumentation, but later when it got changed to
Instrumentation structure in commit b287df70, we forgot to update the
comment.

Reported-by: Wu Fei
Author: Wu Fei
Reviewed-by: Amit Kapila
Backpatch-through: 9.6
Discussion: https://postgr.es/m/52E6E0843B9D774C8C73D6CF64402F0562215EB2@G08CNEXMBPEKD02.g08.fujitsu.local

Branch
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REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/17aa054a79961556da8f6bbc158a7786345ac926

Modified Files
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src/backend/executor/execParallel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)