Update docs/WhatAndWhy/enhancedmemoryprotection.md

Co-authored-by: Michael Kubacki <[email protected]>

docs/WhatAndWhy/enhancedmemoryprotection.md

@@ -35,7 +35,7 @@ to progress will pave the way to a more secure and resilient digital future.
 CPU fault if accessed. This is a future requirement.
 5: Calls to EFI_BOOT_SERVICES.AllocatePages and EFI_BOOT_SERVICES.AllocatePool
 must return memory with the EFI_MEMORY_XP attribute.  
-6: Page 0 in physical system memory must be marked EFI_MEMORY_RP or be unmapped.  
+6: Page 0 in physical system memory must be marked EFI_MEMORY_RP or not mapped.  
 7: AP and BSP stacks must be marked EFI_MEMORY_XP.  
 8: AP and BSP stacks must have an EFI_MEMORY_RP page at the bottom to catch overflow.  
 9: MMIO ranges must be marked EFI_MEMORY_XP.