update with links and other edits

website/docs/tutorials/whats-new-in-graphql-js-v17.md

@@ -1,25 +1,35 @@
-# What's New in graphql-js v17?
+# What's New in `graphql-js` v17?
 
-## Specification Changes
+## Changes by Way of the Specification
 
 ### New Experimental Features
 
 #### Experimental Support for Incremental Delivery
 
+- [Spec PR](https://github.com/graphql/graphql-spec/pull/1110) / [RFC](https://github.com/graphql/graphql-wg/blob/main/rfcs/DeferStream.md)
 - enabled only when using `experimentalExecuteIncrementally()`, use of a schema or operation with `@defer`/`@stream` directives within `execute()` will now throw.
 - enable early execution with the new `enableEarlyExecution` configuration option for `experimentalExecuteIncrementally()`.
 
 #### Experimental Support for Fragment Arguments
 
+- [Spec PR](https://github.com/graphql/graphql-spec/pull/1081) / [RFC](https://github.com/graphql/graphql-wg/blob/main/rfcs/DeferStream.md)
 - enable with the new `experimentalFragmentArguments` configuration option for `parse()`.
 - new experimental `Kind.FRAGMENT_ARGUMENT` for visiting
 - new experimental `TypeInfo` methods and options for handling fragment arguments.
 - coerce AST via new function `coerceInputLiteral()` with experimental fragment variables argument (as opposed to deprecated `valueFromAST()` function).
 
-### Clarifications
+### Specification Clarifications
 
-- Fix ambiguity around when schema definition may be omitted (#3839)
-- No reusing root types (#3453)
+#### Fix ambiguity around when schema definition may be omitted
+
+- [Spec PR](https://github.com/graphql/graphql-spec/pull/987)
+- Schema definition will include only the proper root types.
+
+### Implementation Fixes
+
+#### Enforcing uniqueness of root types
+
+- `graphql-js` now properly enforces that the schema's root types must be unique.
 
 ## New API features
 
@@ -48,5 +58,5 @@
 - Remove deprecated positional arguments for the `GraphQLError` constructor.
 - Remove deprecated distinct Enum types: `KindEnum`, `TokenKindEnum`, and `DirectiveLocationEnum`.
 - Remove deprecated `getVisitFn()` helper function, use `getEnterLeaveForKind()` instead.
-- Remove deprecated `formatError()` and `printError()` helper sfunctions, use `error.toString()` and `error.toJSON()` methods instead.
+- Remove deprecated `formatError()` and `printError()` helper functions, use `error.toString()` and `error.toJSON()` methods instead.
 - Remove deprecated positional arguments for `createSourceEventStream()`.