Merge pull request #26 from ysato/patch-1

Fix formatting for API specification in markdown

Author: cm-kuroeda

book/03-process/02-todo-and-specification.md

@@ -172,7 +172,7 @@ TODOから具体的な技術仕様を策定し、実装の方向性を明確に
 ## 技術仕様
 
 ### API仕様
-```
+```http
 POST /api/users
 Content-Type: application/json