Update base.py

Author: eelkevdbos

fs/base.py

@@ -1308,6 +1308,10 @@ def upload(self, path, file, chunk_size=None, **options):
                 sensible default.
             **options: Implementation specific options required to open
                 the source file.
+                
+        Raises:
+            fs.errors.ResourceNotFound: If a parent directory of
+                ``path`` does not exist.
 
         Note that the file object ``file`` will *not* be closed by this
         method. Take care to close it after this method completes