Improve code examples consistency

Author: vejol

src/content/4/en/part4a.md

@@ -194,8 +194,8 @@ const express = require('express')
 const mongoose = require('mongoose')
 const config = require('./utils/config')
 const logger = require('./utils/logger')
-const notesRouter = require('./controllers/notes')
 const middleware = require('./utils/middleware')
+const notesRouter = require('./controllers/notes')
 
 const app = express()
 

src/content/4/en/part4b.md

@@ -826,8 +826,8 @@ const express = require('express')
 const mongoose = require('mongoose')
 const config = require('./utils/config')
 const logger = require('./utils/logger')
-const notesRouter = require('./controllers/notes')
 const middleware = require('./utils/middleware')
+const notesRouter = require('./controllers/notes')
 
 // ...
 ```

src/content/4/en/part4c.md

@@ -207,11 +207,16 @@ Creating new users happens in compliance with the RESTful conventions discussed
 Let's define a separate <i>router</i> for dealing with users in a new <i>controllers/users.js</i> file. Let's take the router into use in our application in the <i>app.js</i> file, so that it handles requests made to the <i>/api/users</i> url:
 
 ```js
-const usersRouter = require('./controllers/users')
+// ...
+const notesRouter = require('./controllers/notes')
+const usersRouter = require('./controllers/users') // highlight-line
 
 // ...
 
-app.use('/api/users', usersRouter)
+app.use('/api/notes', notesRouter)
+app.use('/api/users', usersRouter) // highlight-line
+
+// ...
 ```
 
 The contents of the file, <i>controllers/users.js</i>, that defines the router is as follows:

src/content/4/fi/osa4a.md

@@ -190,8 +190,8 @@ const express = require('express')
 const mongoose = require('mongoose')
 const config = require('./utils/config')
 const logger = require('./utils/logger')
-const notesRouter = require('./controllers/notes')
 const middleware = require('./utils/middleware')
+const notesRouter = require('./controllers/notes')
 
 const app = express()
 

src/content/4/fi/osa4b.md

@@ -819,8 +819,8 @@ const express = require('express')
 const mongoose = require('mongoose')
 const config = require('./utils/config')
 const logger = require('./utils/logger')
-const notesRouter = require('./controllers/notes')
 const middleware = require('./utils/middleware')
+const notesRouter = require('./controllers/notes')
 
 // ...
 ```

src/content/4/fi/osa4c.md

@@ -208,14 +208,19 @@ Käyttäjien luominen tapahtuu osassa 3 läpikäytyjä [RESTful](/osa3/node_js_j
 Määritellään käyttäjienhallintaa varten oma <i>router</i> tiedostoon <i>controllers/users.js</i>, ja liitetään se <i>app.js</i>-tiedostossa huolehtimaan polulle <i>/api/users/</i> tulevista pyynnöistä:
 
 ```js
-const usersRouter = require('./controllers/users')
+// ...
+const notesRouter = require('./controllers/notes')
+const usersRouter = require('./controllers/users') // highlight-line
 
 // ...
 
-app.use('/api/users', usersRouter)
+app.use('/api/notes', notesRouter)
+app.use('/api/users', usersRouter) // highlight-line
+
+// ...
 ```
 
-Routerin alustava sisältö on seuraava:
+Routerin alustava sisältö tiedostossa <i>controllers/users.js</i> on seuraava:
 
 ```js
 const bcrypt = require('bcrypt')