Update alt-text

Author: Ruchika-mittal01

defender-vulnerability-management/tvm-certificate-inventory.md

@@ -57,7 +57,7 @@ The **Certificate inventory** page opens with a list of the certificates install
 > [!NOTE]
 > Only certificates found on Windows devices (in the local machine certificate store) will be displayed in certificate inventory list.
 
-   :::image type="content" source="/defender/media/defender-vulnerability-management/certificate_inventory.png" alt-text="Screenshot of the certificate inventory list" lightbox="/defender/media/defender-vulnerability-management/certificate_inventory.png":::
+   :::image type="content" source="/defender/media/defender-vulnerability-management/certificate_inventory.png" alt-text="Screenshot of the certificate inventory list." lightbox="/defender/media/defender-vulnerability-management/certificate_inventory.png":::
 
 ## Gain insights into potentially vulnerable certificates