Update articles/defender-for-cloud/quickstart-onboard-gcp.md

Capitalization fix

Author: Jill Grant

articles/defender-for-cloud/quickstart-onboard-gcp.md

@@ -204,7 +204,7 @@ To configure the Defender for Containers plan:
 
 If you choose the Microsoft Defender CSPM plan, you need:
 
-- a Microsoft Azure subscription. If you don't have an Azure subscription, you can [sign up for a free subscription](https://azure.microsoft.com/pricing/free-trial/).
+- A Microsoft Azure subscription. If you don't have an Azure subscription, you can [sign up for a free subscription](https://azure.microsoft.com/pricing/free-trial/).
 - You must [enable Microsoft Defender for Cloud](get-started.md#enable-defender-for-cloud-on-your-azure-subscription) on your Azure subscription.
 - In order to gain access to all of the features available from the CSPM plan, the plan must be enabled by the **Subscription Owner**.