Ensure headings are properly nested (#26638)

Co-authored-by: Octavia Squidington III <octavia-squidington-iii@sers.noreply.github.com>

docs/integrations/sources/aircall.md

@@ -4,7 +4,7 @@ This page contains the setup guide and reference information for the [Aircall](h
 
 ## Prerequisites
 
-Access Token (which acts as bearer token) is mandate for this connector to work, It could be seen at settings (ref - https://dashboard.aircall.io/integrations/api-keys). 
+Access Token (which acts as bearer token) is mandate for this connector to work, It could be seen at settings (ref - https://dashboard.aircall.io/integrations/api-keys).
 
 ## Setup guide
 
@@ -17,17 +17,17 @@ Access Token (which acts as bearer token) is mandate for this connector to work,
     - api_token: Seen at the Aircall settings (ref - https://dashboard.aircall.io/integrations/api-keys)
     - start_date: Date filter for eligible streams, enter
 
-## Step 2: Set up the Aircall connector in Airbyte
+### Step 2: Set up the Aircall connector in Airbyte
 
-### For Airbyte Cloud:
+#### For Airbyte Cloud:
 
 1. [Log into your Airbyte Cloud](https://cloud.airbyte.io/workspaces) account.
 2. In the left navigation bar, click **Sources**. In the top-right corner, click **+new source**.
 3. On the Set up the source page, enter the name for the Aircall connector and select **Aircall** from the Source type dropdown.
 4. Enter your `api_id, api_token and start_date`.
 5. Click **Set up source**.
 
-### For Airbyte OSS:
+#### For Airbyte OSS:
 
 1. Navigate to the Airbyte Open Source dashboard.
 2. Set the name for your source.