Docs/admin-guide/mm/damon: rename the title of the document

The title of the DAMON document for admin-guide, 'Monitoring Data
Accesses', could confuse readers in some ways.  First of all, DAMON is not
the only single way for data access monitoring.  And the document is for
not only the data access monitoring but also data access pattern based
memory management optimizations (DAMOS).  This commit updates the title to
'DAMON: Data Access MONitor', which more explicitly explains what the
document describes.

Link: https://lkml.kernel.org/r/20220909202901.57977-5-sj@kernel.org


Fixes: c4ba6014 ("Documentation: add documents for DAMON")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Yun Levi <ppbuk5246@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>