Global DOCS update: ~~~ replaced with ```

framework/db/DataReader.php

@@ -16,7 +16,7 @@ use yii\base\InvalidCallException;
  * returns all the rows in a single array. Rows of data can also be read by
  * iterating through the reader. For example,
  *
- * ~~~
+ * ```php
  * $command = $connection->createCommand('SELECT * FROM post');
  * $reader = $command->query();
  *
@@ -31,7 +31,7 @@ use yii\base\InvalidCallException;
  *
  * // equivalent to:
  * $rows = $reader->readAll();
- * ~~~
+ * ```
  *
  * Note that since DataReader is a forward-only stream, you can only traverse it once.
  * Doing it the second time will throw an exception.