fix two typos (#4048)

core/client/src/client.rs

@@ -497,7 +497,7 @@ impl<B, E, Block, RA> Client<B, E, Block, RA> where
 	/// Get longest range within [first; last] that is possible to use in `key_changes`
 	/// and `key_changes_proof` calls.
 	/// Range could be shortened from the beginning if some changes tries have been pruned.
-	/// Returns Ok(None) if changes trues are not supported.
+	/// Returns Ok(None) if changes tries are not supported.
 	pub fn max_key_changes_range(
 		&self,
 		first: NumberFor<Block>,

core/network/src/protocol/message.rs

@@ -104,7 +104,7 @@ impl Decode for BlockAttributes {
 pub enum Direction {
 	/// Enumerate in ascending order (from child to parent).
 	Ascending = 0,
-	/// Enumerate in descendfing order (from parent to canonical child).
+	/// Enumerate in descending order (from parent to canonical child).
 	Descending = 1,
 }