fix(types): Fix discordeno/reference.ts (#4363)

* fix(types): Fix discordeno/reference.ts

* Apply suggestions from code review

---------

Co-authored-by: Link <link20050703@gmail.com>

packages/types/src/discordeno/reference.ts

@@ -1,5 +1,15 @@
 /** Types for: https://discord.com/developers/docs/reference */
 
+/**
+ * This is not a mapping of any discord documented type, however there is some docs that refer to an object like this:
+ * https://discord.com/developers/docs/reference#uploading-files, the second paragraph
+ *
+ * > All files[n] parameters must include a valid `Content-Disposition` subpart header with a filename and unique name parameter.
+ *
+ * The blob maps to the FormData data sent and the name maps to the FormData file name.
+ *
+ * @see {@link https://developer.mozilla.org/en-US/docs/Web/API/FormData/set}
+ */
 export interface FileContent {
   /** The file blob */
   blob: Blob