Minor edits to the "Third-party cookies" section (#39388)

* Minor edits to the "Third-party cookies" section

- I think there was some issues with pluralization of the word "Cookie" at the end of this section, so I attempted to reword it.
- I ended up changing more than I originally intended
- I did not intend to change any of the original meaning. If I did, that was a mistake on my part.

* Update files/en-us/web/http/guides/cors/index.md

Co-authored-by: Hamish Willee <[email protected]>

---------

Co-authored-by: Hamish Willee <[email protected]>

Author: DanKaplanSES

files/en-us/web/http/guides/cors/index.md

@@ -360,9 +360,12 @@ Also note that any `Set-Cookie` response header in a response would not set a co
 
 Note that cookies set in CORS responses are subject to normal third-party cookie policies. In the example above, the page is loaded from `foo.example` but the `Set-Cookie` header in the response is sent by `bar.other`, and would thus not be saved if the user's browser is configured to reject all third-party cookies.
 
-Cookie in the request may also be suppressed in normal third-party cookie policies. The enforced cookie policy may therefore nullify the capability described in this chapter, effectively preventing you from making credentialed requests whatsoever.
+Cookies set in CORS requests and responses are subject to normal third-party cookie policies.
 
-Cookie policy around the [SameSite](/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie#samesitesamesite-value) attribute would apply.
+Third-party cookie policies may prevent third party cookies being sent in requests, effectively stopping a site from making credentialed requests even if permitted by the third party server (using `Access-Control-Allow-Credentials`).
+The default policy differs between browsers, but may be set using the [SameSite](/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie#samesitesamesite-value) attribute.
+
+Even if credentialed requests are allowed, a browser may be configured to reject all third-party cookies in responses.
 
 ## The HTTP response headers