Remove whitespace from end of lines

contrib/pg_upgrade/TESTING

doc/src/sgml/client-auth.sgml

doc/src/sgml/func.sgml

doc/src/sgml/installation.sgml

doc/src/sgml/pgupgrade.sgml

doc/src/sgml/ref/pg_dump.sgml

doc/src/sgml/ref/pg_restore.sgml

doc/src/sgml/release.sgml

src/backend/utils/misc/guc-file.l

src/interfaces/libpq/Makefile

src/pl/plperl/expected/plperl_array.out

src/pl/plperl/sql/plperl_array.sql

src/test/regress/expected/alter_table.out

src/test/regress/expected/create_function_3.out

src/test/regress/expected/foreign_data.out

src/test/regress/expected/json.out

src/test/regress/sql/alter_table.sql

src/test/regress/sql/create_function_3.sql

src/test/regress/sql/foreign_data.sql

src/test/regress/sql/json.sql