pgsql: Fix typos in comments

Fix typos in comments

Author: Daniel Gustafsson <daniel@yesql.se>

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/bb1f8f9e5bb13af43ab65faa98ae898a68995070

Modified Files
--------------
src/backend/access/transam/xlogfuncs.c | 2 +-
src/include/lib/simplehash.h | 2 +-
src/include/nodes/execnodes.h | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

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