Minor addition in documentation

src/vk_mem_alloc.h

@@ -1622,6 +1622,9 @@ Features deliberately excluded from the scope of this library:
 
 - Data transfer. Uploading (straming) and downloading data of buffers and images
   between CPU and GPU memory and related synchronization is responsibility of the user.
+  Defining some "texture" object that would automatically stream its data from a
+  staging copy in CPU memory to GPU memory would rather be a feature of another,
+  higher-level library implemented on top of VMA.
 - Allocations for imported/exported external memory. They tend to require
   explicit memory type index and dedicated allocation anyway, so they don't
   interact with main features of this library. Such special purpose allocations