Update task-queue.mdx

Adding escape character

Author: brianmacdonald-temporal

docs/cli/task-queue.mdx

@@ -85,7 +85,7 @@ This command supports updating:
   Weights control the relative share of capacity each key receives.
 
 To unset a rate limit, pass in 'default', for example: --queue-rps-limit default
-To unset specific fairness weights, use --fairness-key-weight-unset <key>
+To unset specific fairness weights, use --fairness-key-weight-unset \<key\>
 To unset all fairness weights, use --fairness-key-weight-unset-all
 
 Use the following options to change the behavior of this command. You can also use any of the [global flags](#global-flags) that apply to all subcommands.