add tagged types agenda item + formatting

Author: leebyron

agendas/2020-06-11.md

@@ -66,8 +66,10 @@ Example agenda item:
 1. Review previous meeting's action items (5m, Lee)
    - [Currently open action items](https://github.com/graphql/graphql-wg/issues?q=is%3Aissue+is%3Aopen+label%3A%22Action+item+%3Aclapper%3A%22)
 1. GraphQL Scalars hosting and coordination: https://www.graphql-scalars.com/ (10m, Evan and Andi)
-1. Input Union Criteria: Unconstrained combination of input types to unions
-   - [PR](https://github.com/graphql/graphql-spec/pull/716) (20m, Benedikt)
-1. GraphQL namespaces
-   - [Issue comment](https://github.com/graphql/graphql-spec/issues/163#issuecomment-629409803) (20m, Courtney)
+1. Input Union Criteria: Unconstrained combination of input types to unions (20m, Benedikt)
+   - [PR](https://github.com/graphql/graphql-spec/pull/716)
+1. Input Union & Tagged Types (30m, Lee, Benjie, Evan, Vince)
+   - [RFC](https://github.com/graphql/graphql-spec/blob/master/rfcs/InputUnion.md)
+1. GraphQL namespaces (20m, Courtney)
+   - [Issue comment](https://github.com/graphql/graphql-spec/issues/163#issuecomment-629409803)
 1. *ADD YOUR AGENDA ABOVE*