Apply suggestions from code review

Co-authored-by: Rowena Jones <[email protected]>

Author: bene2k1

tutorials/overleaf/index.mdx

@@ -26,7 +26,7 @@ It is particularly favored by academics and professionals for producing scientif
 - Installed `git` on your Instance
 - Properly configured DNS A/AAAA records pointing to your Instance's public IP
 
-### Preparing the Environment
+### Preparing the environment
 1. SSH into your Instance:
     ```bash
     ssh root@<YOUR-INSTANCE-IP>
@@ -55,7 +55,7 @@ It is particularly favored by academics and professionals for producing scientif
     ./bin/init
     ```
 
-6. Start the application and it's containers:
+6. Start the application and its containers:
     ```bash
     ./bin/up
     ```
@@ -139,7 +139,7 @@ It is particularly favored by academics and professionals for producing scientif
 apt install python3-certbot-nginx nginx
 ```
 
-2. Obtain an SSL Certificate
+2. Obtain an SSL certificate
 ```bash
 sudo certbot --nginx certonly
 ```
@@ -222,4 +222,4 @@ sudo certbot --nginx certonly
 
 2. Follow the link to the login page (`<http://<YOUR_OVERLEAF_DOMAIN>/login>/`) and enter the credentials you just created. Upon successful login, you'll be directed to a welcome page.
 
-To begin using Overleaf, click the green button at the bottom of the welcome page. For more information, how to use Overleaf, refer to the [official documentation](https://www.overleaf.com/learn).
+To begin using Overleaf, click the green button at the bottom of the welcome page. For more information on how to use Overleaf, refer to the [official documentation](https://www.overleaf.com/learn).