Fix grammatical error of TCP monitor description (#4049)

## Summary
This PR only fixes a small grammatical mistake

## Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this
contribution?
- [ ] Yes  
- [x] No

Author: AlphaRomeoMike

solutions/observability/synthetics/index.md

@@ -35,7 +35,7 @@ You can monitor the status of network endpoints using the following lightweight
 | --- | --- |
 | **HTTP monitor** | Monitor your website. The HTTP monitor checks to make sure specific endpoints return the correctstatus code and display the correct text. |
 | **ICMP monitor** | Check the availability of your hosts. The ICMP monitor uses ICMP (v4 and v6) EchoRequests to check the network reachability of the hosts you are pinging. This will tell you whether thehost is available and connected to the network, but doesn’t tell you if a service on the host is running ornot. |
-| **TCP monitor** | Monitor the services running on your hosts. The TCP monitor checks individual portsto make sure the service is accessible and running. |
+| **TCP monitor** | Monitor the services running on your hosts. The TCP monitor checks individual ports to make sure the service is accessible and running. |
 
 To set up your first monitor, refer to [Get started](/solutions/observability/synthetics/get-started.md).
 
@@ -49,4 +49,4 @@ You can run an automated Synthetics project on a real Chromium browser and view
 
 Alerting helps you detect degraded performance or broken actions before your users do. By receiving alerts early, you can fix issues before they impact your bottom line or customer experience.
 
-To set up your first monitor, refer to [Get started](/solutions/observability/synthetics/get-started.md).
+To set up your first monitor, refer to [Get started](/solutions/observability/synthetics/get-started.md).