updating change log and docs

Author: roleesinhaHC

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 FEATURES:
 * `r/tfe_workspace`: Add `ignore_additional_tag_names` which explicitly ignores `tag_names` _not_ defined by config so they will not be overwritten by the configured tags, by @brandonc and @mbillow [1254](https://github.com/hashicorp/terraform-provider-tfe/pull/1254)
+* `r/tfe_oauth_client`: Add `agent_pool_id` as an optional argument to enable Private VCS support, by @rolee.sinha [1255](https://github.com/hashicorp/terraform-provider-tfe/pull/1255)
 
 BUG FIXES:
 

website/docs/r/oauth_client.html.markdown

@@ -89,6 +89,7 @@ Link.
 * `service_provider` - (Required) The VCS provider being connected with. Valid
   options are `ado_server`, `ado_services`, `bitbucket_hosted`, `bitbucket_server`, `github`, `github_enterprise`, `gitlab_hosted`,
   `gitlab_community_edition`, or `gitlab_enterprise_edition`.
+* `agent_pool_id` - (Optional) An existing Agent pool id within the organization which has Private VCS support enabled via Premium SKU.
 
 ## Attributes Reference