Docs: Update code structure doc

- fix the number of CPU to 8 to avoid Sphinx crash in OpenCI

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I4f05857a639ec2609f5b21cb739a6e91e5372fc0
diff --git a/docs/design_docs/hardware_abstraction_layer.rst b/docs/design_docs/hardware_abstraction_layer.rst
index 89b7092..2a06297 100644
--- a/docs/design_docs/hardware_abstraction_layer.rst
+++ b/docs/design_docs/hardware_abstraction_layer.rst
@@ -71,8 +71,8 @@
     permitted access to those assets. Currently, :term:`TF-M` only needs the
     debug authentication. The whole debug mechanism and related :term:`HAL` will
     be enhanced in the future. Please refer to the :doc:`Debug authentication
-    settings section </integration_guide/platform/platform_folder>` for more
-    details.
+    settings section </integration_guide/source_structure/platform_folder>`
+    for more details.
 
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 Design Principles