Apply new format to snippets and template

snippets/isValidJSON.md

@@ -5,7 +5,7 @@ tags: type,json,intermediate
 
 Checks if the provided string is a valid JSON.
 
-Use `JSON.parse()` and a `try... catch` block to check if the provided string is a valid JSON.
+- Use `JSON.parse()` and a `try... catch` block to check if the provided string is a valid JSON.
 
 ```js
 const isValidJSON = str => {
@@ -22,4 +22,4 @@ const isValidJSON = str => {
 isValidJSON('{"name":"Adam","age":20}'); // true
 isValidJSON('{"name":"Adam",age:"20"}'); // false
 isValidJSON(null); // true
-```
+```