Update batch-synthesis-properties.md

Author: sally-baolian

articles/ai-services/speech-service/batch-synthesis-properties.md

@@ -108,7 +108,6 @@ Here are examples that can result in the 400 error:
 - The number of requested text inputs exceeded the limit of 10,000.
 - You tried to use an invalid deployment ID or a custom voice that isn't successfully deployed. Make sure the Speech resource has access to the custom voice, and the custom voice is successfully deployed. You must also ensure that the mapping of `{"your-custom-voice-name": "your-deployment-ID"}` is correct in your batch synthesis request.
 - You tried to use a _F0_ Speech resource, but the region only supports the _Standard_ Speech resource pricing tier.
-- You tried to create a new batch synthesis job that would exceed the limit of 300 active jobs. Each Speech resource can have up to 300 batch synthesis jobs that don't have a status of "Succeeded" or "Failed".
 
 ### HTTP 404 error