feat: [google-shopping-merchant-datasources] adding some more information about supplemental data sources

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PiperOrigin-RevId: 681900944

Source-Link: https://github.com/googleapis/googleapis/commit/78d1fb208e4af3022a0aaf27bafa578ff326326e

Source-Link: https://github.com/googleapis/googleapis-gen/commit/19badfac8741859ca06f191977455b370e84e14b Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLXNob3BwaW5nLW1lcmNoYW50LWRhdGFzb3VyY2VzLy5Pd2xCb3QueWFtbCIsImgiOiIxOWJhZGZhYzg3NDE4NTljYTA2ZjE5MTk3NzQ1NWIzNzBlODRlMTRiIn0=

BEGIN_NESTED_COMMIT feat: [google-shopping-merchant-datasources] Add FileUploads service docs: A comment for enum value PRODUCTS in enum Channel is changed

PiperOrigin-RevId: 678641097

Source-Link: https://github.com/googleapis/googleapis/commit/9c4c174205d923f9490d534c6e54c2d18ddc9d8f

Source-Link: https://github.com/googleapis/googleapis-gen/commit/13cfe504a6f0aedc0416c23851f278157834f905 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLXNob3BwaW5nLW1lcmNoYW50LWRhdGFzb3VyY2VzLy5Pd2xCb3QueWFtbCIsImgiOiIxM2NmZTUwNGE2ZjBhZWRjMDQxNmMyMzg1MWYyNzgxNTc4MzRmOTA1In0= END_NESTED_COMMIT

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Here is the summary of changes.

You are about to add 2 region tags.

• packages/google-shopping-merchant-datasources/samples/generated_samples/merchantapi_v1beta_generated_file_uploads_service_get_file_upload_async.py:26, tag merchantapi_v1beta_generated_FileUploadsService_GetFileUpload_async
• packages/google-shopping-merchant-datasources/samples/generated_samples/merchantapi_v1beta_generated_file_uploads_service_get_file_upload_sync.py:26, tag merchantapi_v1beta_generated_FileUploadsService_GetFileUpload_sync

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[ohmayr]

This PR has failing unit test presubmits.

[parthea]

Wait for https://github.com/googleapis/gapic-generator-python/pull/2205