Fix docs

Author: colinodell

docs/2.3/customization/block-parsing.md

@@ -97,10 +97,10 @@ If `canHaveLazyContinuationLines()` returned `true`, this method will be called
 public function tryContinue(Cursor $cursor, BlockContinueParserInterface $activeBlockParser): ?BlockContinue;
 ```
 
-### `closeBlock()`
-
 This method allows you to try and parse an additional line of Markdown.
 
+### `closeBlock()`
+
 ```php
 public function closeBlock(): void;
 ```