Remove obsolete comments

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/include/psa/crypto_struct.h b/include/psa/crypto_struct.h
index bc56a4f..1153b8e 100644
--- a/include/psa/crypto_struct.h
+++ b/include/psa/crypto_struct.h
@@ -493,9 +493,6 @@
 
 /**
  * \brief The context for PSA interruptible hash signing.
- *
- * \note  Contents not yet designed as implementation specific.
- *
  */
 struct psa_sign_hash_interruptible_operation_s {
     /** Unique ID indicating which driver got assigned to do the
@@ -524,9 +521,6 @@
 
 /**
  * \brief The context for PSA interruptible hash verification.
- *
- * \note  Contents not yet designed as implementation specific.
- *
  */
 struct psa_verify_hash_interruptible_operation_s {
     /** Unique ID indicating which driver got assigned to do the