Add version badge to docs referencing file.size (#1641)

* Add version badge to docs referencing file.size

* Add version badge for file.lastModified

* Update files.md

* edits

---------

Co-authored-by: Mike Bostock <[email protected]>

Author: gvanhorne

docs/files.md

@@ -10,7 +10,12 @@ Load files — whether static or generated dynamically by a [data loader](./data
 import {FileAttachment} from "npm:@observablehq/stdlib";
 ```
 
-The `FileAttachment` function takes a path and returns a file handle. This handle exposes the file’s name, [MIME type](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types), size in bytes <a href="https://github.com/observablehq/framework/releases/tag/v1.11.0" class="observablehq-version-badge" data-version="^1.11.0" title="Added in 1.11.0"></a>, and modification time <a href="https://github.com/observablehq/framework/releases/tag/v1.4.0" class="observablehq-version-badge" data-version="^1.4.0" title="Added in 1.4.0"></a> (represented as the number of milliseconds since UNIX epoch).
+The `FileAttachment` function takes a path and returns a file handle. This handle exposes:
+
+* `name` - the file’s name (such as `volcano.json`),
+* `mimeType` - [MIME type](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types) (such as `application/json`),
+* `lastModified` - modification time <a href="https://github.com/observablehq/framework/releases/tag/v1.4.0" class="observablehq-version-badge" data-version="^1.4.0" title="Added in 1.4.0"></a> (in milliseconds since epoch), and
+* `size` - size in bytes <a href="https://github.com/observablehq/framework/releases/tag/v1.11.0" class="observablehq-version-badge" data-version="^1.11.0" title="Added in 1.11.0"></a>.
 
 ```js echo
 FileAttachment("volcano.json")