Docs/mm/damon/index: add links to design

DAMON subsystem documents index page provides a short intro of DAMON core
concepts.  Add links to sections of the design document to let users
easily browse to the details.

Link: https://lkml.kernel.org/r/20240701192706.51415-9-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/mm/damon/design.rst

@@ -141,6 +141,7 @@ as Idle page tracking does.
 Core Logics
 ===========
 
+.. _damon_design_monitoring:
 
 Monitoring
 ----------

Documentation/mm/damon/index.rst

@@ -6,7 +6,7 @@ DAMON: Data Access MONitor
 
 DAMON is a Linux kernel subsystem that provides a framework for data access
 monitoring and the monitoring results based system operations.  The core
-monitoring mechanisms of DAMON (refer to :doc:`design` for the detail) make it
+monitoring :ref:`mechanisms <damon_design_monitoring>` of DAMON make it
 
  - *accurate* (the monitoring output is useful enough for DRAM level memory
    management; It might not appropriate for CPU Cache levels, though),
@@ -21,10 +21,11 @@ users who have special information about their workloads can write personalized
 applications for better understanding and optimizations of their workloads and
 systems.
 
-For easier development of such systems, DAMON provides a feature called DAMOS
-(DAMon-based Operation Schemes) in addition to the monitoring.  Using the
-feature, DAMON users in both kernel and user spaces can do access-aware system
-operations with no code but simple configurations.
+For easier development of such systems, DAMON provides a feature called
+:ref:`DAMOS <damon_design_damos>` (DAMon-based Operation Schemes) in addition
+to the monitoring.  Using the feature, DAMON users in both kernel and user
+spaces can do access-aware system operations with no code but simple
+configurations.
 
 .. toctree::
    :maxdepth: 2