fix typos[skip ci]

Author: awxiaoxian2020

src/site/markdown/dynamic-sql.md

@@ -15,7 +15,7 @@ The Dynamic SQL elements should be familiar to anyone who has used JSTL or any s
 
 The most common thing to do in dynamic SQL is conditionally include a part of a where clause. For example:
 
-```
+```xml
 <select id="findActiveBlogWithTitleLike"
      resultType="Blog">
   SELECT * FROM BLOG