Update README.md (#631)

Ensure variables in examples are valid

Author: Kledal

README.md

@@ -453,7 +453,7 @@ func main() {
 	config := openai.DefaultAzureConfig("your Azure OpenAI Key", "https://your Azure OpenAI Endpoint")
 	// If you use a deployment name different from the model name, you can customize the AzureModelMapperFunc function
 	// config.AzureModelMapperFunc = func(model string) string {
-	// 	azureModelMapping = map[string]string{
+	// 	azureModelMapping := map[string]string{
 	// 		"gpt-3.5-turbo": "your gpt-3.5-turbo deployment name",
 	// 	}
 	// 	return azureModelMapping[model]
@@ -559,7 +559,7 @@ func main() {
 
 	//If you use a deployment name different from the model name, you can customize the AzureModelMapperFunc function
 	//config.AzureModelMapperFunc = func(model string) string {
-	//    azureModelMapping = map[string]string{
+	//    azureModelMapping := map[string]string{
 	//        "gpt-3.5-turbo":"your gpt-3.5-turbo deployment name",
 	//    }
 	//    return azureModelMapping[model]