Fix of doc

Author: martin-kolarik

src/mysql.rs

@@ -32,15 +32,15 @@ pub struct MySqlSessionStore {
 
 impl MySqlSessionStore {
     /// constructs a new MySqlSessionStore from an existing
-    /// sqlx::PgPool.  the default table name for this session
+    /// sqlx::MySqlPool.  the default table name for this session
     /// store will be "async_sessions". To override this, chain this
     /// with [`with_table_name`](crate::MySqlSessionStore::with_table_name).
     ///
     /// ```rust
     /// # use async_sqlx_session::MySqlSessionStore;
     /// # use async_session::Result;
     /// # fn main() -> Result { async_std::task::block_on(async {
-    /// let pool = sqlx::PgPool::connect(&std::env::var("MYSQL_TEST_DB_URL").unwrap()).await.unwrap();
+    /// let pool = sqlx::MySqlPool::connect(&std::env::var("MYSQL_TEST_DB_URL").unwrap()).await.unwrap();
     /// let store = MySqlSessionStore::from_client(pool)
     ///     .with_table_name("custom_table_name");
     /// store.migrate().await;