Clarify RI tuple-lock result handling comments

Explain that returning false for TM_SelfModified follows ExecLockRows(),
which skips such tuples. This differs from TM_Updated, which is
unexpected in READ COMMITTED with FIND_LAST_VERSION.

Also remove "fall through to error" from the TM_Updated comment, since
the code calls elog(ERROR) directly.

Reported-by: Amit Kapila <[email protected]>
Discussion: 
https://postgr.es/m/caa4ek1lk1dfgifpl-hcczm-nm+exg+fcsodh8kpw6bobuzf...@mail.gmail.com
Backpatch-through: 19

Branch
------
REL_19_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ca3fd678f47becc5b84e0b027b2f062c5ad05b2b

Modified Files
--------------
src/backend/utils/adt/ri_triggers.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

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