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/session/src/lib.rs

@@ -587,14 +587,9 @@ pub mod pallet {
 		///
 		/// The dispatch origin of this function must be signed.
 		///
-		/// # <weight>
-		/// - Complexity: `O(1)`. Actual cost depends on the number of length of
-		///   `T::Keys::key_ids()` which is fixed.
-		/// - DbReads: `origin account`, `T::ValidatorIdOf`, `NextKeys`
-		/// - DbWrites: `origin account`, `NextKeys`
-		/// - DbReads per key id: `KeyOwner`
-		/// - DbWrites per key id: `KeyOwner`
-		/// # </weight>
+		/// ## Complexity
+		/// - `O(1)`. Actual cost depends on the number of length of `T::Keys::key_ids()` which is
+		///   fixed.
 		#[pallet::call_index(0)]
 		#[pallet::weight(T::WeightInfo::set_keys())]
 		pub fn set_keys(origin: OriginFor<T>, keys: T::Keys, proof: Vec<u8>) -> DispatchResult {
@@ -614,13 +609,9 @@ pub mod pallet {
 		/// means being a controller account) or directly convertible into a validator ID (which
 		/// usually means being a stash account).
 		///
-		/// # <weight>
-		/// - Complexity: `O(1)` in number of key types. Actual cost depends on the number of length
-		///   of `T::Keys::key_ids()` which is fixed.
-		/// - DbReads: `T::ValidatorIdOf`, `NextKeys`, `origin account`
-		/// - DbWrites: `NextKeys`, `origin account`
-		/// - DbWrites per key id: `KeyOwner`
-		/// # </weight>
+		/// ## Complexity
+		/// - `O(1)` in number of key types. Actual cost depends on the number of length of
+		///   `T::Keys::key_ids()` which is fixed.
 		#[pallet::call_index(1)]
 		#[pallet::weight(T::WeightInfo::purge_keys())]
 		pub fn purge_keys(origin: OriginFor<T>) -> DispatchResult {