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Updating Storage API Autosharding documentation to include that it do…
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…esn't work on Runner V2 (#28233)

* add documentation

* doc for python too
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ahmedabu98 authored Sep 18, 2023
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Expand Up @@ -788,6 +788,8 @@ BigQuery Storage Write API for Python SDK currently has some limitations on supp
{{< paragraph class="language-py" >}}
**Note:** If you want to run WriteToBigQuery with Storage Write API from the source code, you need to run `./gradlew :sdks:java:io:google-cloud-platform:expansion-service:build` to build the expansion-service jar. If you are running from a released Beam SDK, the jar will already be included.

**Note:** Auto sharding is not currently supported for Python's Storage Write API.

{{< /paragraph >}}

#### Exactly-once semantics
Expand Down Expand Up @@ -877,6 +879,8 @@ explicitly enable this using [`withAutoSharding`](https://beam.apache.org/releas

***Note:*** `STORAGE_WRITE_API` will default to dynamic sharding when
`numStorageWriteApiStreams` is set to 0 or is unspecified.

***Note:*** Auto sharding with `STORAGE_WRITE_API` is supported on Dataflow's legacy runner, but **not** on Runner V2
{{< /paragraph >}}

When using `STORAGE_WRITE_API`, the PCollection returned by
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