minor video docs on how to install (#7341)

* minor video docs on how to install

* Update video_load.mdx

Author: lhoestq

docs/source/video_load.mdx

@@ -10,7 +10,7 @@ Video datasets have [`Video`] type columns, which contain `decord` objects.
 
 <Tip>
 
-To work with video datasets, you need to have the `vision` dependency installed. Check out the [installation](./installation#vision) guide to learn how to install it.
+To work with video datasets, you need to have the `decord` package installed. Check out the [installation](https://github.com/dmlc/decord?tab=readme-ov-file#installation) guide to learn how to install it, or the [related discussions](https://github.com/dmlc/decord/issues/213).
 
 </Tip>