updated docs

README.md

@@ -48,7 +48,7 @@ const sk = require('scikitjs')
 sk.setBackend(tf)
 ```
 
-Note: If you have ESM enabled (by setting type="module" in your package.json), then you can consume this libary with import / export, like in the following code block.
+Note: If you have ESM enabled (by setting type="module" in your package.json), then you can consume this library with import / export, like in the following code block.
 
 ```js
 import * as tf from '@tensorflow/tfjs-node'

docs/docs/tutorial.md

@@ -11,21 +11,23 @@ Let's discover **Scikit.js in less than 5 minutes**.
 Get started by **installing the library**.
 
 ```shell
-npm install scikitjs
+npm install scikitjs @tensorflow/tfjs
 ```
 
 or
 
 ```shell
-yarn add scikitjs
+yarn add scikitjs @tensorflow/tfjs
 ```
 
 ## Build a model
 
 Build a simple Linear Regression
 
 ```js
-import { LinearRegression } from 'scikitjs'
+import * as tf from '@tensorflow/tfjs'
+import { LinearRegression, setBackend } from 'scikitjs'
+setBackend(tf)
 
 let X = [
   [2, 3],