docs: admin-guide/mm/index: Fix reference to nonexistent document

Fix the following warning:

WARNING: toctree contains reference to nonexistent document
'admin-guide/mm/nommu-map'

This was due to a typo.

Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Link: https://lore.kernel.org/r/20200718165107.625847-1-dwlsalmeida@gmail.com


Signed-off-by: Jonathan Corbet <corbet@lwn.net>