I have rectified an unspecified determiner.

Author: davidmturner

documentation/versioned_docs/version-1.5.0/fastly:secret-store/SecretStore/SecretStore.mdx

@@ -39,7 +39,7 @@ A new `SecretStore` object.
 
 ## Examples
 
-In this example we connect to an Secret Store named `'secrets'` and retrieve a secret named `'cat-api-key'` use the value in a Request header.
+In this example we connect to a Secret Store named `'secrets'` and retrieve a secret named `'cat-api-key'` use the value in a Request header.
 
 ```js
 /// <reference types="@fastly/js-compute" />