Fix type hint for Select::where

Author: Marcus Pettersen Irgens

lib/internal/Magento/Framework/DB/Select.php

@@ -91,6 +91,12 @@ public function __construct(
      * $select->where('id = :id');
      * </code>
      *
+     * You may also construct IN statements:
+     *
+     * <code>
+     * $select->where('entity_id IN (?)', ['1', '2', '3']);
+     * </code>
+     *
      * Note that it is more correct to use named bindings in your
      * queries for values other than strings. When you use named
      * bindings, don't forget to pass the values when actually
@@ -101,7 +107,7 @@ public function __construct(
      * </code>
      *
      * @param string $cond The WHERE condition.
-     * @param string $value OPTIONAL A single value to quote into the condition.
+     * @param string|array|null $value OPTIONAL An optional single or array value to quote into the condition.
      * @param string|int|null $type OPTIONAL The type of the given value
      * @return \Magento\Framework\DB\Select
      */