Fixed typo in block module help output (#10926)

Co-authored-by: Marko <marbar3778@yahoo.com>

client/rpc/block.go

@@ -16,7 +16,7 @@ import (
 func BlockCommand() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "block [height]",
-		Short: "Get verified data for a the block at given height",
+		Short: "Get verified data for the block at given height",
 		Args:  cobra.MaximumNArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			clientCtx, err := client.GetClientQueryContext(cmd)