Update files.md (#1252)

fix broken link to data loaders

Author: scresawn

docs/files.md

@@ -4,7 +4,7 @@ keywords: file, fileattachment, attachment
 
 # Files
 
-Load files — whether static or generated dynamically by a [data loader](../loaders) — using the built-in `FileAttachment` function. This is available by default in Markdown, but you can import it explicitly like so:
+Load files — whether static or generated dynamically by a [data loader](./loaders) — using the built-in `FileAttachment` function. This is available by default in Markdown, but you can import it explicitly like so:
 
 ```js echo
 import {FileAttachment} from "npm:@observablehq/stdlib";