cleanup <weight></weight> from docs comments (#13350)

* cleanup <weight></weight> from docs comments

* Changes to address review commnets

* Fix CI cargo test --docs

---------

Co-authored-by: parity-processbot <>

substrate/frame/system/src/lib.rs

@@ -374,9 +374,8 @@ pub mod pallet {
 	impl<T: Config> Pallet<T> {
 		/// Make some on-chain remark.
 		///
-		/// # <weight>
+		/// ## Complexity
 		/// - `O(1)`
-		/// # </weight>
 		#[pallet::call_index(0)]
 		#[pallet::weight(T::SystemWeightInfo::remark(_remark.len() as u32))]
 		pub fn remark(origin: OriginFor<T>, _remark: Vec<u8>) -> DispatchResultWithPostInfo {
@@ -396,16 +395,8 @@ pub mod pallet {
 
 		/// Set the new runtime code.
 		///
-		/// # <weight>
+		/// ## Complexity
 		/// - `O(C + S)` where `C` length of `code` and `S` complexity of `can_set_code`
-		/// - 1 call to `can_set_code`: `O(S)` (calls `sp_io::misc::runtime_version` which is
-		///   expensive).
-		/// - 1 storage write (codec `O(C)`).
-		/// - 1 digest item.
-		/// - 1 event.
-		/// The weight of this function is dependent on the runtime, but generally this is very
-		/// expensive. We will treat this as a full block.
-		/// # </weight>
 		#[pallet::call_index(2)]
 		#[pallet::weight((T::BlockWeights::get().max_block, DispatchClass::Operational))]
 		pub fn set_code(origin: OriginFor<T>, code: Vec<u8>) -> DispatchResultWithPostInfo {
@@ -417,13 +408,8 @@ pub mod pallet {
 
 		/// Set the new runtime code without doing any checks of the given `code`.
 		///
-		/// # <weight>
+		/// ## Complexity
 		/// - `O(C)` where `C` length of `code`
-		/// - 1 storage write (codec `O(C)`).
-		/// - 1 digest item.
-		/// - 1 event.
-		/// The weight of this function is dependent on the runtime. We will treat this as a full
-		/// block. # </weight>
 		#[pallet::call_index(3)]
 		#[pallet::weight((T::BlockWeights::get().max_block, DispatchClass::Operational))]
 		pub fn set_code_without_checks(
@@ -1423,10 +1409,8 @@ impl<T: Config> Pallet<T> {
 
 	/// Deposits a log and ensures it matches the block's log data.
 	///
-	/// # <weight>
+	/// ## Complexity
 	/// - `O(1)`
-	/// - 1 storage write (codec `O(1)`)
-	/// # </weight>
 	pub fn deposit_log(item: generic::DigestItem) {
 		<Digest<T>>::append(item);
 	}