Correct a couple years of accumulated typos

common/db/src/create_db.rs

@@ -22,7 +22,7 @@ pub fn serai_db_key(
 ///
 /// * `db_name` - A database name
 /// * `field_name` - An item name
-/// * `args` - Comma seperated list of key arguments
+/// * `args` - Comma separated list of key arguments
 /// * `field_type` - The return type
 ///
 /// # Example

common/db/src/mem.rs

@@ -6,7 +6,7 @@ use std::{
 
 use crate::*;
 
-/// An atomic operation for the in-memory databae.
+/// An atomic operation for the in-memory database.
 #[must_use]
 #[derive(PartialEq, Eq, Debug)]
 pub struct MemDbTxn<'a>(&'a MemDb, HashMap<Vec<u8>, Vec<u8>>, HashSet<Vec<u8>>);