chore(docs): improve some comments (#13937)

* chore(docs): improve some comments

* Update client/network/common/src/sync/message.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Update client/rpc-api/src/chain/mod.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Update client/rpc/src/chain/mod.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Update client/rpc/src/chain/mod.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Update frame/staking/src/pallet/impls.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

---------

Co-authored-by: Koute <koute@users.noreply.github.com>

substrate/client/network/common/src/sync/message.rs

@@ -185,7 +185,7 @@ pub mod generic {
 		pub blocks: Vec<BlockData<Header, Hash, Extrinsic>>,
 	}
 
-	/// Announce a new complete relay chain block on the network.
+	/// Announce a new complete block on the network.
 	#[derive(Debug, PartialEq, Eq, Clone)]
 	pub struct BlockAnnounce<H> {
 		/// New block header.

substrate/client/network/common/src/sync/warp.rs

@@ -32,7 +32,7 @@ pub struct WarpProofRequest<B: BlockT> {
 
 /// The different types of warp syncing.
 pub enum WarpSyncParams<Block: BlockT> {
-	/// Standard warp sync for the relay chain
+	/// Standard warp sync for the chain.
 	WithProvider(Arc<dyn WarpSyncProvider<Block>>),
 	/// Skip downloading proofs and wait for a header of the state that should be downloaded.
 	///
@@ -48,7 +48,7 @@ pub enum VerificationResult<Block: BlockT> {
 	Complete(SetId, AuthorityList, Block::Header),
 }
 
-/// Warp sync backend. Handles retrieveing and verifying warp sync proofs.
+/// Warp sync backend. Handles retrieving and verifying warp sync proofs.
 pub trait WarpSyncProvider<Block: BlockT>: Send + Sync {
 	/// Generate proof starting at given block hash. The proof is accumulated until maximum proof
 	/// size is reached.