chore: fix some typos (#2098)

Author: Evelina331

historic/src/client/online_client.rs

@@ -292,7 +292,7 @@ async fn get_metadata<T: Config>(
             })?;
 
         // Option because we may have asked for a version that doesn't exist. Compact because we get back a Vec<u8>
-        // of the metadata bytes, and the Vec is preceeded by it's compact encoded length. The actual bytes are then
+        // of the metadata bytes, and the Vec is preceded by it's compact encoded length. The actual bytes are then
         // decoded as a `RuntimeMetadataPrefixed`, after this.
         let (_, metadata) = <Option<(Compact<u32>, RuntimeMetadataPrefixed)>>::decode(&mut &rpc_response[..])
             .map_err(|e| OnlineClientAtBlockError::CannotGetMetadata {

historic/src/error.rs

@@ -30,7 +30,7 @@ pub enum Error {
     StorageValueError(#[from] StorageValueError),
 }
 
-/// Errors consctructing an online client.
+/// Errors constructing an online client.
 #[allow(missing_docs)]
 #[derive(Debug, thiserror::Error)]
 #[non_exhaustive]

metadata/src/utils/validation.rs

@@ -921,14 +921,14 @@ mod tests {
         // Build metadata with both pallets.
         let metadata_both = pallets_to_metadata(pallets);
 
-        // Hashing will ignore any non-existant pallet and return the same result.
+        // Hashing will ignore any non-existent pallet and return the same result.
         let hash = MetadataHasher::new(&metadata_one)
             .only_these_pallets(&["First", "Second"])
             .hash();
         let hash_rhs = MetadataHasher::new(&metadata_one)
             .only_these_pallets(&["First"])
             .hash();
-        assert_eq!(hash, hash_rhs, "hashing should ignore non-existant pallets");
+        assert_eq!(hash, hash_rhs, "hashing should ignore non-existent pallets");
 
         // Hashing one pallet from metadata with 2 pallets inserted will ignore the second pallet.
         let hash_second = MetadataHasher::new(&metadata_both)