improve 'running locally' documentation to reference queue-based inge…

…stion

Co-authored-by: David Blatcher <[email protected]>

docs/02-running/01-running-locally.md

@@ -59,7 +59,8 @@ If you haven't used the `--with-local-auth` flag, you'll begin a Google authenti
 
 If you have used the `--no-auth` flag you'll be signed in automatically as John Doe (with no oauth flow) and will have ALL permissions.
 
-Note that there's currently a 20MB limit per file on uploads to image-loader (see `client_max_body_size` in nginx mappings).
+Note that there's currently a 20MB limit per file on direct/legacy uploads to image-loader (see `client_max_body_size` in nginx mappings). Theoretically you could upload such large files directly to the S3watcher bucket with something like `aws s3 cp --endpoint http://localhost:4576 ...`.
+No such limit applies to the queue-based ingestion (see https://github.com/guardian/grid/pull/4201), which is the default for a fresh local setup.
 
 ## Cerebro