pgsql: Add comment that ec_relids excludes "child" EquivalenceClass mem

Add comment that ec_relids excludes "child" EquivalenceClass members.

This was already documented a few lines further down, but the comment
just beside the field declaration could be misleading. Per gripe
from Kyotaro Horiguchi.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/8cf0ad1ea38db3e16ac04b408168df4c937862e6

Modified Files
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src/include/nodes/relation.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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