Fix link to SaveFile command from ExportTileset

Author: dacap

api/command/ExportTileset.md

@@ -11,4 +11,4 @@ This is similar to
 using [the `-export-tileset` argument from the CLI](https://www.aseprite.org/docs/cli/#export-tileset)
 with [`-format=json-array` option](https://www.aseprite.org/docs/cli/#format).
 
-This command accept the same parameters as [app.command.SaveFileCopyAs](command/SaveFile.md#savefile).
+This command accept the same parameters as [app.command.SaveFileCopyAs](SaveFile.md#savefile).