Fix comment typos (https://github.com/scroll-tech/zkevm-circuits/issues/1219)

bus-mapping/src/rpc.rs

@@ -115,7 +115,7 @@ impl<P: JsonRpcClient> GethClient<P> {
     }
 
     /// Calls `eth_getBlockByNumber` via JSON-RPC returning a [`Block`]
-    /// returning all the block information including it's transaction's
+    /// returning all the block information including its transaction's
     /// details.
     pub async fn get_block_by_number(
         &self,

gadgets/src/is_zero.rs

@@ -1,7 +1,7 @@
 //! IsZero gadget works as follows:
 //!
 //! Given a `value` to be checked if it is zero:
-//!  - witnesses `inv0(value)`, where `inv0(x)` is 0 when `x` = 0, and
+//!  - witnesses: `inv0(value)`, where `inv0(x)` is 0 when `x` = 0, and
 //!  `1/x` otherwise
 
 use eth_types::Field;

zktrie/src/state.rs

@@ -69,7 +69,7 @@ impl ZktrieState {
     /// return true if the switch success, or false if db have not contain
     /// corresponding root yet
     /// notice the cached key would not be clean if we can successfully swith to
-    /// new snapshot since we consider it is not need to send more nodes data
+    /// new snapshot since we consider it is not needed to send more nodes data
     /// from storage trace for the updated leafs
     pub fn switch_to(&mut self, new_root: ZkTrieHash) -> bool {
         let test_trie = self.zk_db.borrow_mut().new_trie(&new_root);