Clarified spec

include/aidge/backend/TensorImpl.hpp

@@ -93,7 +93,7 @@ public:
     virtual const void* hostPtr() const { return nullptr; };
 
     /**
-     * Sets the device pointer.
+     * Sets the device pointer. The previously owned data is deleted.
      * UNSAFE: directly setting the device pointer may lead to undefined behavior
      * if it does not match the required storage.
      * @param ptr A valid device pointer.