Docs: remove link to deprecated tutorial (#28889)

The rekey and rotate tutorial is being deprecated, so this link
pointing to it needs to be removed.

website/content/docs/commands/operator/rekey.mdx

@@ -21,9 +21,6 @@ An unseal key may be provided directly on the command line as an argument to the
 command. If key is specified as "-", the command will read from stdin. If a TTY
 is available, the command will prompt for text.
 
-Please see the [rotating and rekeying](/vault/tutorials/operations/rekeying-and-rotating) for
-step-by-step instructions.
-
 ## Examples
 
 Initialize a rekey: