Remove duplicate comments (#6638)

substrate/frame/nicks/src/lib.rs

@@ -244,8 +244,6 @@ mod tests {
 	};
 	use sp_core::H256;
 	use frame_system::EnsureSignedBy;
-	// The testing primitives are very useful for avoiding having to work with signatures
-	// or public keys. `u64` is used as the `AccountId` and no `Signature`s are required.
 	use sp_runtime::{
 		Perbill, testing::Header, traits::{BlakeTwo256, IdentityLookup, BadOrigin},
 	};
@@ -254,9 +252,6 @@ mod tests {
 		pub enum Origin for Test  where system = frame_system {}
 	}
 
-	// For testing the pallet, we construct most of a mock runtime. This means
-	// first constructing a configuration type (`Test`) which `impl`s each of the
-	// configuration traits of pallets we want to use.
 	#[derive(Clone, Eq, PartialEq)]
 	pub struct Test;
 	parameter_types! {
@@ -324,11 +319,8 @@ mod tests {
 	type Balances = pallet_balances::Module<Test>;
 	type Nicks = Module<Test>;
 
-	// This function basically just builds a genesis storage key/value store according to
-	// our desired mockup.
 	fn new_test_ext() -> sp_io::TestExternalities {
 		let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
-		// We use default for brevity, but you can configure as desired if needed.
 		pallet_balances::GenesisConfig::<Test> {
 			balances: vec![
 				(1, 10),