Documentation: damon: reclaim: Convert "Free Page Reporting" citation link

Use internal cross-reference for the citation link to Free Page
Reporting docs.

Signed-off-by: Bagas Sanjaya <[email protected]>

Author: bagasme

Documentation/admin-guide/mm/damon/reclaim.rst

@@ -298,4 +298,4 @@ granularity reclamation. ::
 
 .. [1] https://research.google/pubs/pub48551/
 .. [2] https://lwn.net/Articles/787611/
-.. [3] https://www.kernel.org/doc/html/latest/mm/free_page_reporting.html
+.. [3] Documentation/mm/free_page_reporting.rst