docs: some typos and clarifications (#1923)

docs/installation/heroku.md

@@ -15,16 +15,15 @@ Feel free to update these credentials in the settings after installation.
 ### Configuration 
 
 Your Monica instance will use a [ClearDB Ignite plan](https://elements.heroku.com/addons/cleardb) (free) by default. Additional environment variables, such as details of the mail server, can be added after setup through the Heroku interface.
-Monica doesn't require a lot of power - it means it will run on the free plan provided by Heroku. 
+Monica doesn't require a lot of power - it will run perfectly fine on the free plan provided by Heroku. 
 
-Note the configuration of your app should look like this:
+After deployment, the configuration of your app should look like this:
 
 ![Picture Of Configuration](https://user-images.githubusercontent.com/25419741/45253146-9f904800-b362-11e8-916b-8980fc2a83d8.png)
 
-Note that when you deploy with the heroku button, only 1 dyno is activated for the "web" one - that is OK.
-The "queue" dyno is only helpful if you set `QUEUE_DRIVER=database` (default is 'sync').
+Note that when you deploy with the "Deploy to Heroku" purple button, only 1 dyno ("web") is activated while the "queue" one is not. That is OK - the "queue" dyno is only helpful if you set `QUEUE_DRIVER=database` (default is 'sync').
 
-In addition, Make sure to setup a new job that runs every hour using the Heroku Scheudler, on the bottom of the screen shown above. After creating a new job, set it to be: `php artisan schedule:run`.
+In addition, make sure to setup a new job that runs every hour using the Heroku Scheduler (it's located on the bottom of the screen shown above). After creating a new job, set it to be: `php artisan schedule:run`.
 
 ### Generating Personal Access Tokens