Documentation/page_tables: Add info about MMU/TLB and Page Faults

Extend page_tables.rst by adding a section about the role of MMU and TLB
in translating between virtual addresses and physical page frames.
Furthermore explain the concept behind Page Faults and how the Linux
kernel handles TLB misses. Finally briefly explain how and why to disable
the page faults handler.

Cc: Andrew Morton <[email protected]>
Cc: Ira Weiny <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Randy Dunlap <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: "Fabio M. De Francesco" <[email protected]>
Acked-by: "Mike Rapoport (IBM)" <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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