workflow_streams: tighten README intro and fix samples link

Drop the payload/codec paragraph from the README intro — it duplicates
material that the docs site guide already covers. Update the samples
link to the new workflow-streams directory and the docs link to the
libraries section.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jssmith

temporalio/contrib/workflow_streams/README.md

@@ -17,20 +17,17 @@ long-poll subscriptions, and a Query exposes the current global offset.
 The library packages the boilerplate that turns those primitives into
 a usable stream: batching to amortize per-event overhead, deduplication
 for exactly-once delivery, topic filtering, and continue-as-new helpers
-that hand stream state across Workflow runs. Payloads ride as Temporal
-`Payload`s so codec chains (encryption, compression) run once on the
-signal/update envelope — never per item — and typed decode is available
-to subscribers via `result_type=T`.
+that hand stream state across Workflow runs.
 
 ## Documentation
 
 📖 **The full guide lives in the Temporal documentation site:**
-**[Workflow Streams — Python SDK](https://docs.temporal.io/develop/python/workflows/workflow-stream)**
+**[Workflow Streams — Python SDK](https://docs.temporal.io/develop/python/libraries/workflow-streams)**
 
 It covers installation, enabling streaming on a Workflow, publishing from
 Workflows and Activities, subscribing, continue-as-new, delivery semantics,
 codec and payload encoding, architecture, and caveats — with runnable code
 snippets throughout.
 
-For a runnable end-to-end example, see the
-[Workflow Streams sample](https://github.com/temporalio/samples-python/tree/main/pubsub).
+For runnable end-to-end examples, see the
+[Workflow Streams samples](https://github.com/temporalio/samples-python/tree/main/workflow-streams).