Fix missing words in Access-Control-Expose-Headers (#2963)

files/en-us/web/http/headers/access-control-expose-headers/index.html

@@ -9,7 +9,7 @@
 ---
 <div>{{HTTPSidebar}}</div>
 
-<p>The <strong><code>Access-Control-Expose-Headers</code></strong> allows a server to indicate which response headers should be made available to  scripts running in the browser, in response to a cross-origin request.</p>
+<p>The <strong><code>Access-Control-Expose-Headers</code></strong> response header allows a server to indicate which response headers should be made available to scripts running in the browser, in response to a cross-origin request.</p>
 
 <p>Only the {{Glossary("CORS-safelisted response header", "CORS-safelisted response headers")}} are exposed by default. For clients to be able to access other headers, the server must list them using the <code>Access-Control-Expose-Headers</code> header.</p>