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

+1 -1
+1 -1
Documentation/arm64/memory.txt
··· 17 the same bits set to 1. TTBRx selection is given by bit 63 of the 18 virtual address. The swapper_pg_dir contains only kernel (global) 19 mappings while the user pgd contains only user (non-global) mappings. 20 - The swapper_pgd_dir address is written to TTBR1 and never written to 21 TTBR0. 22 23
··· 17 the same bits set to 1. TTBRx selection is given by bit 63 of the 18 virtual address. The swapper_pg_dir contains only kernel (global) 19 mappings while the user pgd contains only user (non-global) mappings. 20 + The swapper_pg_dir address is written to TTBR1 and never written to 21 TTBR0. 22 23