docs: Decouple refrences from /docs folder

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I1955201382074eb9e6dd80aadbc456eb09aecb22
diff --git a/tools/documentation/tfm_cmake_defaults.py b/tools/documentation/tfm_cmake_defaults.py
index 0acfbc8..1820b6a 100644
--- a/tools/documentation/tfm_cmake_defaults.py
+++ b/tools/documentation/tfm_cmake_defaults.py
@@ -171,7 +171,7 @@
 
     # Documentation base path
     tfm_def_doc_root = os.path.join(tfm_def_root_dir, "docs")
-    tfm_def_copy_doc_root = os.path.join(tfm_def_copy_dir, "docs")
+    tfm_def_copy_doc_root = tfm_def_copy_dir
 
     # Disable copyfiles for next invocation
     cmake_env["SPHINXCFG_COPY_FILES"] = "False"