Fix it's and its to be correct.

src/backend/access/transam/xact.c

src/backend/catalog/pg_operator.c

src/backend/commands/trigger.c

src/backend/executor/execMain.c

src/backend/executor/execProcnode.c

src/backend/executor/nodeMaterial.c

src/backend/libpq/be-pqexec.c

src/backend/main/main.c

src/backend/rewrite/rewriteHandler.c

src/backend/storage/buffer/bufmgr.c

src/backend/utils/adt/numeric.c

src/backend/utils/adt/ruleutils.c

src/backend/utils/mmgr/aset.c

src/bin/psql/tab-complete.c

src/include/utils/pg_lzcompress.h

src/interfaces/odbc/convert.c

src/interfaces/odbc/drvconn.c

src/interfaces/odbc/info.c

src/interfaces/odbc/parse.c

src/interfaces/odbc/pgtypes.c