Update setup.en.md (#3270)

* [doc] run as root

* [doc] update setup guide headings

docs/setup.en.md

@@ -10,7 +10,7 @@ This guide describes how to install and setup Misskey.
 
 *1.* Create Misskey user
 ----------------------------------------------------------------
-Running misskey on root is not a good idea so we create a user for that.
+Running misskey as root is not a good idea so we create a user for that.
 In debian for exemple :
 
 ```
@@ -32,7 +32,7 @@ Please install and setup these softwares:
 
 *3.* Setup MongoDB
 ----------------------------------------------------------------
-In root :
+As root:
 1. `mongo` Go to the mongo shell
 2. `use misskey` Use the misskey database
 3. `db.users.save( {dummy:"dummy"} )` Write dummy data to initialize the db.
@@ -47,17 +47,17 @@ In root :
 4. `git checkout $(git tag -l | grep -v 'rc[0-9]*$' | sort -V | tail -n 1)` Checkout to the [latest release](https://github.com/syuilo/misskey/releases/latest)
 5. `npm install` Install misskey dependencies.
 
-*(optional)* Generating VAPID keys
+*(optional)* Generate VAPID keys
 ----------------------------------------------------------------
 If you want to enable ServiceWorker, you need to generate VAPID keys:
-Unless you have set your global node_modules location elsewhere, you need to run this in root.
+Unless you have set your global node_modules location elsewhere, you need to run this as root.
 
 ``` shell
 npm install web-push -g
 web-push generate-vapid-keys
 ```
 
-*5.* Make configuration file
+*5.* Configure Misskey
 ----------------------------------------------------------------
 1. `cp .config/example.yml .config/default.yml` Copy the `.config/example.yml` and rename it to `default.yml`.
 2. Edit `default.yml`
@@ -114,7 +114,7 @@ WantedBy=multi-user.target
 
 You can check if the service is running with `systemctl status misskey`.
 
-### Way to Update to latest version of your Misskey
+### How to update your Misskey server to the latest version
 1. `git fetch`
 2. `git checkout $(git tag -l | grep -v 'rc[0-9]*$' | sort -V | tail -n 1)`
 3. `npm install`