style: format markdown files with remark-lint

diff --git a/docs/graph/euler.md b/docs/graph/euler.md
index 7fbca75..1d52627 100644 (file)
--- a/docs/graph/euler.md
+++ b/docs/graph/euler.md
@@ -134,6 +134,7 @@ $$
       int to;
       bool exists;
       int revref;
+    ```
 
       bool operator<(const edge& b) const { return to < b.to; }
     };