docs: Add notes on artifact streaming (#11863)

Signed-off-by: Yuan Tang <terrytangyuan@gmail.com>

docs/configure-artifact-repository.md

@@ -554,3 +554,12 @@ configuring the default artifact repository described previously.
  command: [sh, -c]
  args: ["cp -r /my-input-artifact /my-output-artifact"]
 ```
+
+## Artifact Streaming
+
+With artifact streaming, artifacts don’t need to be saved to disk first. Artifact streaming is only supported in the following
+artifact drivers: S3 (v3.4+), Azure Blob (v3.4+), HTTP (v3.5+), and Artifactory (v3.5+).
+
+Previously, when a user would click the button to download an artifact in the UI, the artifact would need to be written to the
+Argo Server’s disk first before downloading. If many users tried to download simultaneously, they would take up
+disk space and fail the download.