Docs: Clean and restructure the Integration guide

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I8dca6e3d5cf5cae3a5cd3dc8f2b1e518ab3c20cf
diff --git a/docs/platform/ext/platform_introduction.rst b/docs/platform/ext/platform_introduction.rst
index 2d2eb68..b6fecda 100644
--- a/docs/platform/ext/platform_introduction.rst
+++ b/docs/platform/ext/platform_introduction.rst
@@ -66,5 +66,5 @@
 
         - :doc:`RSS. </platform/ext/target/arm/rss/readme>`
 
-The document :doc:`Platform Deprecation and Removal </platform/ext/platform_deprecation>`
-lists the deprecated platforms planned to be removed from upstream.
+The document :doc:`Platform Deprecation and Removal </integration_guide/platform/platform_deprecation>`
+lists the deprecated platforms, removed from the upstream.