Typo fixes (#544)

docs/post_installation/firststeps-rp.en.md

@@ -281,7 +281,7 @@ Start the new containers with:
     ```
 
 
-Now, there's only one thing left to do, which is setup the certs so that the mail services can use them as well, since Traefik 2 uses an acme v2 format to save ALL the license from all the domains we have, we'll need to find a way to dump the certs, lucky we have [this tiny container](https://hub.docker.com/r/humenius/traefik-certs-dumper) which grabs the `acme.json` file trough a volume, and a variable `DOMAIN=example.org`, and with these, the container will output the `cert.pem` and `key.pem` files, for this we'll simply run the `traefik-certs-dumper` container binding the `/traefik` volume to the folder where our `acme.json` is saved, bind the `/output` volume to our mailcow `data/assets/ssl/` folder, and set up the `DOMAIN=example.org` variable to the domain we want the certs dumped from. 
+Now, there's only one thing left to do, which is setup the certs so that the mail services can use them as well, since Traefik 2 uses an acme v2 format to save ALL the license from all the domains we have, we'll need to find a way to dump the certs, lucky we have [this tiny container](https://hub.docker.com/r/humenius/traefik-certs-dumper) which grabs the `acme.json` file through a volume, and a variable `DOMAIN=example.org`, and with these, the container will output the `cert.pem` and `key.pem` files, for this we'll simply run the `traefik-certs-dumper` container binding the `/traefik` volume to the folder where our `acme.json` is saved, bind the `/output` volume to our mailcow `data/assets/ssl/` folder, and set up the `DOMAIN=example.org` variable to the domain we want the certs dumped from. 
 
 This container will watch over the `acme.json` file for any changes, and regenerate the `cert.pem` and `key.pem` files directly into `data/assets/ssl/` being the path binded to the container's `/output` path.
 
@@ -289,7 +289,7 @@ You can use the command line to run it, or use the docker-compose.yml shown [her
 
 After we have the certs dumped, we'll have to reload the configs from our postfix and dovecot containers, and check the certs, you can see how [here](https://mailcow.github.io/mailcow-dockerized-docs/firststeps-ssl/#how-to-use-your-own-certificate).
 
-Aaand that should be it 😊, you can check if the Traefik router works fine trough Traefik's dashboard / traefik logs / accessing the setted domain trough https, or / and check HTTPS, SMTP and IMAP trough the commands shown on the page linked before.
+Aaand that should be it 😊, you can check if the Traefik router works fine through Traefik's dashboard / traefik logs / accessing the setted domain through https, or / and check HTTPS, SMTP and IMAP through the commands shown on the page linked before.
 
 
 ### Caddy v2 (supported by the community)