Manual page dash cleanup.

src/man/abort.l

src/man/alter_table.l

src/man/begin.l

src/man/catalogs.3

src/man/cleardbdir.1

src/man/close.l

src/man/cluster.l

src/man/commit.l

src/man/copy.l

src/man/create_aggregate.l

src/man/create_database.l

src/man/create_function.l

src/man/create_index.l

src/man/create_language.l

src/man/create_operator.l

src/man/create_rule.l

src/man/create_sequence.l

src/man/create_table.l

src/man/create_trigger.l

src/man/create_type.l