Fix comments that were mis-wrapped, for Tom Lane.

contrib/spi/refint.c

src/backend/access/gist/gistscan.c

src/backend/access/hash/hashsearch.c

src/backend/access/heap/tuptoaster.c

src/backend/access/nbtree/nbtsearch.c

src/backend/access/nbtree/nbtutils.c

src/backend/commands/_deadcode/version.c

src/backend/commands/command.c

src/backend/executor/execQual.c

src/backend/executor/nodeLimit.c

src/backend/executor/nodeMergejoin.c

src/backend/optimizer/path/clausesel.c

src/backend/optimizer/path/indxpath.c

src/backend/rewrite/rewriteDefine.c

src/backend/storage/ipc/ipc.c

src/backend/storage/ipc/sinval.c

src/backend/utils/adt/formatting.c

src/backend/utils/adt/selfuncs.c

src/backend/utils/cache/lsyscache.c

src/backend/utils/cache/relcache.c