DOC: update 'aws_ssm_default_patch_baseline' doc to include 'AMAZON_LINUX_2023' as valid value for 'operating_system' (#44662)

Author: kevingunn-wk

website/docs/r/ssm_default_patch_baseline.html.markdown

@@ -39,6 +39,7 @@ This resource supports the following arguments:
   `AMAZON_LINUX`,
   `AMAZON_LINUX_2`,
   `AMAZON_LINUX_2022`,
+  `AMAZON_LINUX_2023`,
   `CENTOS`,
   `DEBIAN`,
   `MACOS`,