Expand comment a little bit
The previous commit removed a comment that was a bit more verbose than
its replacement.
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/839a8eb2b3df68e105fb4f7a72e71652d6becc7a
Modified Files
--------------
src/backend/executor/nodeModifyTable.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
