fix UPGRADE.md

UPGRADE.md

@@ -5,7 +5,7 @@ there is version B between A and C, you need to following the instructions for b
 
 ## Upgrade from 1.x to 2.x
 
-* Add `ColumnInterface` support and change type of parameter `$type` from `string` to `ColumnInterface|string` 
+Add `ColumnInterface` support and change type of parameter `$type` from `string` to `ColumnInterface|string` 
 in `addColumn()` method of your classes that implement the following interfaces:
 
 - `Yiisoft\Db\Command\CommandInterface`;
@@ -18,4 +18,4 @@ in `addColumn()` method of your classes that implement the following interfaces:
 - `Yiisoft\Db\QueryBuilder\AbstractQueryBuilder`.
 
 `$columns` parameter of `Query::select()` and `Query::addSelect()` methods can also accept scalar values of `bool`, 
-`float` or `int` types or array with scalar values. For example, `$query->select(1)` will be converted to `SELECT 1`.
+`float` or `int` types or array with scalar values. For example, `$query->select(1)` will be converted to `SELECT 1`.