Updating syntax to match latest version

[lazzurs]

Small changes to update the syntax to the latest version of the provider.

https://github.com/hashicorp/terraform-provider-aws/pull/22667/files

what

• Updated description parameter to new name
• Updated number of cache clusters to the new parameter name

why

• The Terraform provider has changed the syntax in the latest version

references

• https://github.com/hashicorp/terraform-provider-aws/pull/22667/files

[woz5999]

/test all

[mergify[bot]]

This pull request is now in conflict. Could you fix it @lazzurs? 🙏