docs: Add frontmatter to ref architecture topic (#2837)

* docs: Add frontmatter to ref architecture topic

* docs: Fix typo

website/content/docs/oss/installing/reference-architectures.mdx

@@ -1,3 +1,10 @@
+---
+layout: docs
+page_title: Reference Architectures
+description: |-
+  Boundary reference architectures
+---
+
 # Reference Architectures
 A number of community-supported reference architectures for non-dev deployments can be found in Boundary's dedicated [reference architecture repo](https://github.com/hashicorp/boundary-reference-architecture).