Add endpoint-id to workergroup params

Author: LucasArmandVast

documentation/serverless/create-endpoints-and-workergroups.mdx

@@ -106,7 +106,8 @@ curl --location 'https://console.vast.ai/api/v0/endptjobs/' \
 
 - `api_key`(string): The Vast API key associated with the account that controls the Endpoint. The key can also be placed in the header as an Authorization: Bearer.
 - `endpoint_name`(string): The name of the Endpoint that the Workergroup will be created under.
-
+OR
+- 'endpoint_id' (integer): The id of the Endpoint that the Workergroup will be created under.
 AND one of the following:
 
 - `template_hash` (string): The hexadecimal string that identifies a particular template. 
@@ -123,7 +124,6 @@ OR
 - `launch_args` (string): A command-line style string containing additional parameters for instance creation that will be parsed and applied when the autoscaler creates new workers. This allows you to customize instance configuration beyond what's specified in templates.
 
 
-
 **Optional** (Default values will be assigned if not specified):
 
 - `gpu_ram` (integer): The amount of GPU memory (VRAM) in gigabytes that your model or workload requires to run. This parameter tells the serverless engine how much GPU memory your model needs. Default value is 24.