Docs: Move the design documents a level up

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: Ib366994121b7c57c5f4966499c2364f339d11b05
diff --git a/docs/configuration/profiles/tfm_profile_medium.rst b/docs/configuration/profiles/tfm_profile_medium.rst
index 9f98542..cd3bb34 100644
--- a/docs/configuration/profiles/tfm_profile_medium.rst
+++ b/docs/configuration/profiles/tfm_profile_medium.rst
@@ -467,7 +467,7 @@
 
 .. [RFC7251] `AES-CCM Elliptic Curve Cryptography (ECC) Cipher Suites for TLS <https://tools.ietf.org/html/rfc7251>`_
 
-.. [CRYPTO-DESIGN] :doc:`Crypto design </technical_references/design_docs/tfm_crypto_design>`
+.. [CRYPTO-DESIGN] :doc:`Crypto design </design_docs/tfm_crypto_design>`
 
 .. [ITS-INTEGRATE] :doc:`ITS integration guide </integration_guide/services/tfm_its_integration_guide>`