sphinx: add missing newline for conf.py files.

gcc/d/ChangeLog:

	* doc/conf.py: Add newline at last line.

gcc/ChangeLog:

	* doc/cpp/conf.py: Add newline at last line.
	* doc/cppinternals/conf.py: Add newline at last line.
	* doc/gcc/conf.py: Add newline at last line.
	* doc/gccint/conf.py: Add newline at last line.
	* doc/install/conf.py: Add newline at last line.

gcc/fortran/ChangeLog:

	* doc/gfc-internals/conf.py: Add newline at last line.
	* doc/gfortran/conf.py: Add newline at last line.

gcc/go/ChangeLog:

	* doc/conf.py: Add newline at last line.

libgomp/ChangeLog:

	* doc/conf.py: Add newline at last line.

libiberty/ChangeLog:

	* doc/conf.py: Add newline at last line.

libitm/ChangeLog:

	* doc/conf.py: Add newline at last line.

libquadmath/ChangeLog:

	* doc/conf.py: Add newline at last line.