Documentation/arm64/memory.txt: fix typo
There is no swapper_pgd_dir, it meant swapper_pg_dir.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
authored by Alex Bennée and committed by Catalin Marinas a24637d5 74c3deac