docs: add astream v2 migration guide links (#21845)

- docs: v0.2 version sidebar
- x
- x
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@ -11,6 +11,7 @@ LangChain v0.2 was released in May 2024. This release includes a number of [brea
:::note Reference :::note Reference
- [Breaking Changes & Deprecations](/docs/versions/v0_2/deprecations) - [Breaking Changes & Deprecations](/docs/versions/v0_2/deprecations)
- [Migrating to Astream Events v2](/docs/versions/v0_2/migrating_astream_events)
::: :::
@ -23,6 +24,7 @@ This documentation will help you upgrade your code to LangChain `0.2.x.`. To pre
3. Install a recent version of `langchain-cli` , and use the tool to replace old imports used by your code with the new imports. (See instructions below.) 3. Install a recent version of `langchain-cli` , and use the tool to replace old imports used by your code with the new imports. (See instructions below.)
4. Manually resolve any remaining deprecation warnings. 4. Manually resolve any remaining deprecation warnings.
5. Re-run unit tests. 5. Re-run unit tests.
6. If you are using `astream_events`, please review how to [migrate to astream events v2](/docs/versions/v0_2/migrating_astream_events).
## Upgrade to new imports ## Upgrade to new imports