Updated steps for cert creation to make command example. (#24280)

Step 2 of the 'Create a CA Chain File' states to upload the contents of ca.pem, but if following the command examples, the CA chain file will be called ca-chain.pem.

Updated steps so the name is the same in both the command example and step for uploading to Cloudflare

Author: dledfordcf

src/content/docs/cloudflare-one/identity/devices/access-integrations/mutual-tls-authentication.mdx

@@ -181,7 +181,7 @@ This section covers how to use [OpenSSL](https://www.openssl.org/) to generate a
 
 	The intermediate certificate should be at the top of the file, followed by its signing certificate.
 
-2. Upload the contents of `ca.pem` to Cloudflare Access. For instructions, refer to [Add mTLS to your Access application](#add-mtls-to-your-access-application).
+2. Upload the contents of `ca-chain.pem` to Cloudflare Access. For instructions, refer to [Add mTLS to your Access application](#add-mtls-to-your-access-application).
 
 #### Generate a client certificate