Docs/mm/damon/design: add links from overall architecture to sections of details

DAMON design document briefly explains the overall layers architecture
first, and then provides detailed explanations of each layer with
dedicated sections.  Letting readers go directly to the detailed sections
for specific layers could help easy browsing of the not-very-short
document.  Add links from the overall summary to the sections of details.

Link: https://lkml.kernel.org/r/20240701192706.51415-5-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

@@ -22,13 +22,15 @@ Overall Architecture
 
 DAMON subsystem is configured with three layers including
 
-- Operations Set: Implements fundamental operations for DAMON that depends on
-  the given monitoring target address-space and available set of
-  software/hardware primitives,
-- Core: Implements core logics including monitoring overhead/accuracy control
-  and access-aware system operations on top of the operations set layer, and
-- Modules: Implements kernel modules for various purposes that provides
-  interfaces for the user space, on top of the core layer.
+- :ref:`Operations Set <damon_operations_set>`: Implements fundamental
+  operations for DAMON that depends on the given monitoring target
+  address-space and available set of software/hardware primitives,
+- :ref:`Core <damon_core_logic>`: Implements core logics including monitoring
+  overhead/accuracy control and access-aware system operations on top of the
+  operations set layer, and
+- :ref:`Modules <damon_modules>`: Implements kernel modules for various
+  purposes that provides interfaces for the user space, on top of the core
+  layer.
 
 
 .. _damon_design_configurable_operations_set:
@@ -140,6 +142,8 @@ conflict with the reclaim logic using ``PG_idle`` and ``PG_young`` page flags,
 as Idle page tracking does.
 
 
+.. _damon_core_logic:
+
 Core Logics
 ===========
 
@@ -512,6 +516,8 @@ interface, namely ``include/linux/damon.h``.  Please refer to the API
 :doc:`document </mm/damon/api>` for details of the interface.
 
 
+.. _damon_modules:
+
 Modules
 =======