Fix multipart file description

docs/s3-api-docs.md

@@ -17,7 +17,7 @@ This is the API documentation for the AEC 2024 Skill 08 Session 3 API.
 
   <ul>
     <li>Simple Key-Value Pairs: These are straightforward pairs like <code>caption: "My super cool post caption!"</code>.</li>
-    <li>File Uploads: When uploading a file, specify the key and provide the file using its path, such as <code>image: "/path/to/file/image.jpg"</code>.</li>
+    <li>File Uploads: When uploading a file, specify the key and provide the file's content.</li>
     <li>Nested Keys: If you need to send nested data, you can use the following format: <code>foo[bar][baz]: "value"</code>.</li>
     <li>Arrays: When sending arrays, you additionally need to specify the index of the array element. For example, <code>arr[0][key]: "abc"</code>.</li>
   </ul>