Fix broken link in part2c

Author: Moiman

src/content/2/en/part2c.md

@@ -94,7 +94,7 @@ A synchronous way of making requests that's common in Java programming, for inst
 ```java
 HTTPRequest request = new HTTPRequest();
 
-String url = "https://fullstack-exampleapp.herokuapp.com/data.json";
+String url = "https://studies.cs.helsinki.fi/exampleapp/data.json";
 List<Note> notes = request.get(url);
 
 notes.forEach(m => {

src/content/2/es/part2c.md

@@ -94,7 +94,7 @@ Una forma síncrona de realizar solicitudes que es común en la programación Ja
 ```java
 HTTPRequest request = new HTTPRequest();
 
-String url = "https://fullstack-exampleapp.herokuapp.com/data.json";
+String url = "https://studies.cs.helsinki.fi/exampleapp/data.json";
 List<Note> notes = request.get(url);
 
 notes.forEach(m => {

src/content/2/fi/osa2c.md

@@ -90,7 +90,7 @@ Esim. Java-ohjelmoinnista tuttu synkroninen tapa tehdä kyselyjä etenisi seuraa
 ```java
 HTTPRequest request = new HTTPRequest();
 
-String url = "https://fullstack-exampleapp.herokuapp.com/data.json";
+String url = "https://studies.cs.helsinki.fi/exampleapp/data.json";
 List<Note> notes = request.get(url);
 
 notes.forEach(m => {

src/content/2/fr/part2c.md

@@ -94,7 +94,7 @@ Une manière synchrone de faire des requêtes qui est courante dans la programma
 ```java
 HTTPRequest request = new HTTPRequest();
 
-String url = "https://fullstack-exampleapp.herokuapp.com/data.json";
+String url = "https://studies.cs.helsinki.fi/exampleapp/data.json";
 List<Note> notes = request.get(url);
 
 notes.forEach(m => {

src/content/2/pt/part2c.md

@@ -94,7 +94,7 @@ Uma forma comum de fazer requisições síncronas em Java, por exemplo, funciona
 ```java
 HTTPRequest request = new HTTPRequest();
 
-String url = "https://fullstack-exampleapp.herokuapp.com/data.json";
+String url = "https://studies.cs.helsinki.fi/exampleapp/data.json";
 List<Note> notes = request.get(url);
 
 notes.forEach(m => {

src/content/2/zh/part2c.md

@@ -112,7 +112,7 @@ xhttp.send()
 ```java
 HTTPRequest request = new HTTPRequest();
 
-String url = "https://fullstack-exampleapp.herokuapp.com/data.json";
+String url = "https://studies.cs.helsinki.fi/exampleapp/data.json";
 List<Note> notes = request.get(url);
 
 notes.forEach(m => {