Merge branch 'remove-data-nbytes-from-documentation' into 'develop'

doc: remove `data_nbytes` from Python Producer client documentation

See merge request !235

producer/api/python/asapo_producer.pyx.in

@@ -103,7 +103,7 @@ cdef void* data_pointer(data) except? NULL:
     cdef const unsigned char[::1] memview = reshaped_view
     return <void*>&memview[0]
 
-def data_nbytes(data):
+cdef data_nbytes(data):
     if data is None:
         return 0
     return memoryview(data).nbytes