fix

Author: MathieuBsqt

pages/public_cloud/ai_machine_learning/endpoints_guide_03_troubleshooting/guide.en-gb.md

@@ -59,7 +59,7 @@ Alternatively, please **[reach out to us to discuss increasing your limits](http
 
 ### When using AI Endpoints, I am facing "Resource tag 'discovery' is forbidden"
 
-This error occurs when you are trying to use AI Endpoints with an access key that was created from a Public Cloud project in **Discovery mode**, which doesn't have a payment method.
+This error occurs when you try to use AI Endpoints with an access key from a Public Cloud project that is in **Discovery mode**, which means this project does not have a payment method associated with it.
 
 To resolve this error, add a payment method to your Public Cloud project and try again.