Merge pull request #1515 from reobin/patch-1

Fix typo in installation developer docs

Author: catarak

developer_docs/installation.md

@@ -25,7 +25,7 @@ _Note_: The installation steps assume you are using a Unix-like shell. If you ar
    * For Mac OSX with [homebrew](http://brew.sh/): `brew tap mongodb/brew` then `brew install mongodb-community` and finally start the server with `brew services start mongodb-community` or you can visit the installation guide here [Installation Guide For MacOS](https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/)
    * For Windows and Linux: [MongoDB Installation](https://docs.mongodb.com/manual/installation/)
 7. `$ cp .env.example .env`
-8. (Optional) Update `.env` with necessary keys to enable certain app behavoirs, i.e. add Github ID and Github Secret if you want to be able to log in with Github.
+8. (Optional) Update `.env` with necessary keys to enable certain app behaviors, i.e. add Github ID and Github Secret if you want to be able to log in with Github.
 9. `$ npm run fetch-examples` - this downloads the example sketches into a user called 'p5'
 10. `$ npm start`
 11. Navigate to [http://localhost:8000](http://localhost:8000) in your browser