Add boundary to codeowners (#1201)

Author: rmainwork

CODEOWNERS

@@ -52,3 +52,6 @@
 #HCP IAM
 /content/hcp-docs/content/partials/hcp-administration/* @hashicorp/cloud-access-control @hashicorp/cloud-identity
 /content/hcp-docs/content/docs/hcp/iam/* @hashicorp/cloud-access-control @hashicorp/cloud-identity
+
+# Boundary
+/content/boundary/* @hashicorp/boundary-education-approvers @hashicorp/boundary