Update part3a.md

id to string from the notes array, to make the notes.find(note => note.id === id) in app.get('/api/notes/:id') work properly without string to int conversion

Author: Vopexx

src/content/3/en/part3a.md

@@ -187,17 +187,17 @@ const http = require('http')
 // highlight-start
 let notes = [
   {
-    id: 1,
+    id: "1",
     content: "HTML is easy",
     important: true
   },
   {
-    id: 2,
+    id: "2",
     content: "Browser can execute only JavaScript",
     important: false
   },
   {
-    id: 3,
+    id: "3",
     content: "GET and POST are the most important methods of HTTP protocol",
     important: true
   }