fix typos (#1644)

util/src/rlp/untrusted_rlp.rs

@@ -201,7 +201,7 @@ impl<'a, 'view> View<'a, 'view> for UntrustedRlp<'a> where 'a: 'view {
 			return Err(DecoderError::RlpExpectedToBeList);
 		}
 
-		// move to cached position if it's index is less or equal to
+		// move to cached position if its index is less or equal to
 		// current search index, otherwise move to beginning of list
 		let c = self.offset_cache.get();
 		let (mut bytes, to_skip) = match c.index <= index {
@@ -334,9 +334,9 @@ impl<'a> BasicDecoder<'a> {
 	/// Return first item info.
 	fn payload_info(bytes: &[u8]) -> Result<PayloadInfo, DecoderError> {
 		let item = try!(PayloadInfo::from(bytes));
-		match item.header_len.checked_add(item.value_len) { 
-			Some(x) if x <= bytes.len() => Ok(item), 
-			_ => Err(DecoderError::RlpIsTooShort), 
+		match item.header_len.checked_add(item.value_len) {
+			Some(x) if x <= bytes.len() => Ok(item),
+			_ => Err(DecoderError::RlpIsTooShort),
 		}
 	}
 }

util/src/trie/triedb.rs

@@ -84,7 +84,7 @@ impl<'db> TrieDB<'db> {
 		ret
 	}
 
-	/// Convert a vector of hashes to a hashmap of hash to occurances.
+	/// Convert a vector of hashes to a hashmap of hash to occurrences.
 	pub fn to_map(hashes: Vec<H256>) -> HashMap<H256, u32> {
 		let mut r: HashMap<H256, u32> = HashMap::new();
 		for h in hashes.into_iter() {
@@ -93,7 +93,7 @@ impl<'db> TrieDB<'db> {
 		r
 	}
 
-	/// Determine occurances of items in the backing database which are not related to this
+	/// Determine occurrences of items in the backing database which are not related to this
 	/// trie.
 	pub fn db_items_remaining(&self) -> HashMap<H256, i32> {
 		let mut ret = self.db.keys();

util/src/triehash.rs

@@ -255,7 +255,7 @@ fn hash256rlp(input: &[(Vec<u8>, Vec<u8>)], pre_len: usize, stream: &mut RlpStre
 		begin += len;
 	}
 
-	// if fist key len is equal prefix, append it's value
+	// if fist key len is equal prefix, append its value
 	match pre_len == key.len() {
 		true => { stream.append(&value); },
 		false => { stream.append_empty_data(); }