Fix copilot review comments on Go quickstart

- Remove dead AZURE_OPENAI_EMBEDDING_API_VERSION env var (Go SDK manages versioning internally)
- Update PR description to reflect correct product (Cosmos DB NoSQL)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: diberry

articles/cosmos-db/quickstart-vector-store-go.md

@@ -146,7 +146,6 @@ Find the sample code with resource provisioning on [GitHub](https://github.com/A
     ```ini
     # Azure OpenAI Embedding Settings
     AZURE_OPENAI_EMBEDDING_MODEL=text-embedding-3-small
-    AZURE_OPENAI_EMBEDDING_API_VERSION=2024-08-01-preview
     AZURE_OPENAI_EMBEDDING_ENDPOINT=
 
     # Cosmos DB configuration
@@ -162,6 +161,9 @@ Find the sample code with resource provisioning on [GitHub](https://github.com/A
     VECTOR_ALGORITHM=diskann
     ```
 
+    > [!NOTE]
+    > The Go `azopenai` SDK manages API versioning internally. No API version environment variable is needed.
+
     Replace the placeholder values in the `.env` file with your own information:
     - `AZURE_OPENAI_EMBEDDING_ENDPOINT`: Your Azure OpenAI resource endpoint URL
     - `AZURE_COSMOSDB_ENDPOINT`: Your Azure Cosmos DB endpoint URL