fix(adminmanual): Fix Amazon SSEC link

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: ChristophWurst

admin_manual/configuration_files/primary_storage.rst

@@ -209,7 +209,7 @@ You can find out more information about upscaling with object storage and Nextcl
 SSE-C encryption support
 ------------------------
 
-Nextcloud supports server side encryption, also known as `SSE-C <http://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html>`, with compatible S3 bucket provider. The encryption and decryption happens on the S3 bucket side with a key provided by the Nextcloud server.
+Nextcloud supports server side encryption, also known as `SSE-C <http://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html>`_, with compatible S3 bucket provider. The encryption and decryption happens on the S3 bucket side with a key provided by the Nextcloud server.
 
 The key can be specified with the :code:`sse_c_key` parameter which needs to be provided as a base64 encoded string with a maximum length of 32 bytes. A random key could be generated using the the following command: