update installation guide

docs/src/docPages/general/installation.md

@@ -2,15 +2,15 @@
 
 tiptap has a very modular package structure and is independent of any framework. Depending on what you want to do with tiptap there are a few different ways to install tiptap in your project. Choose the way that fits your project best.
 
-## Vanilla JavaScript
+## Plain JavaScript
 
 Use tiptap with vanilla JavaScript for a very lightweight and raw experience. If you feel like it, you can even use it to connect the tiptap core with other frameworks not mentioned here.
 
 ```bash
-# Use npm
+# With npm
 npm install @tiptap/core @tiptap/starter-kit
 
-# Or: Use Yarn
+# With yarn
 yarn add @tiptap/core @tiptap/starter-kit
 ```
 
@@ -18,11 +18,11 @@ Great, that should be enough to start. Here is the most essential code you need
 
 ```js
 import { Editor } from '@tiptap/core'
-import extensions from '@tiptap/starter-kit'
+import defaultExtensions from '@tiptap/starter-kit'
 
 new Editor({
   element: document.getElementsByClassName('element'),
-  extensions: extensions(),
+  extensions: defaultExtensions(),
   content: '<p>Your content.</p>',
 })
 ```