Documentation: perf-security: Convert security credentials bibliography link

Use internal cross-reference for bibliography link to security
credentials docs.

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

Author: bagasme

Documentation/admin-guide/perf-security.rst

@@ -311,7 +311,7 @@ Bibliography
 .. [2] `<http://man7.org/linux/man-pages/man2/perf_event_open.2.html>`_
 .. [3] `<http://web.eece.maine.edu/~vweaver/projects/perf_events/>`_
 .. [4] `<https://perf.wiki.kernel.org/index.php/Main_Page>`_
-.. [5] `<https://www.kernel.org/doc/html/latest/security/credentials.html>`_
+.. [5] Documentation/security/credentials.rst
 .. [6] `<http://man7.org/linux/man-pages/man7/capabilities.7.html>`_
 .. [7] `<http://man7.org/linux/man-pages/man2/ptrace.2.html>`_
 .. [8] `<https://en.wikipedia.org/wiki/Hardware_performance_counter>`_