add frame_system::DefaultConfig to individual pallet DefaultConfigs (#14453)

* add frame_system::DefaultConfig to individual pallet DefaultConfigs

* Fixes tests

* Minor fix

* ".git/.scripts/commands/fmt/fmt.sh"

* Adds UI Tests

---------

Co-authored-by: Nikhil Gupta <17176722+gupnik@users.noreply.github.com>
Co-authored-by: command-bot <>

substrate/frame/system/src/lib.rs

@@ -203,7 +203,7 @@ pub mod pallet {
 	use crate::{self as frame_system, pallet_prelude::*, *};
 	use frame_support::pallet_prelude::*;
 
-	/// Contains default types suitable for various environments
+	/// Default implementations of [`DefaultConfig`], which can be used to implement [`Config`].
 	pub mod config_preludes {
 		use super::DefaultConfig;
 
@@ -342,8 +342,6 @@ pub mod pallet {
 		///
 		/// Expects the `PalletInfo` type that is being generated by `construct_runtime!` in the
 		/// runtime.
-		///
-		/// For tests it is okay to use `()` as type, however it will provide "useless" data.
 		#[pallet::no_default]
 		type PalletInfo: PalletInfo;