Update api spec

Author: mkht

Docs/Add-RealtimeSessionItem.md

@@ -58,7 +58,7 @@ Position: 0
 ```
 
 ### -ContentTranscript
-The transcript of the audio, used for `input_audio` content type.
+The transcript of the audio, used for `input_audio` and `audio` content types.
 
 ```yaml
 Type: String
@@ -67,7 +67,7 @@ Position: Named
 ```
 
 ### -ContentType
-The content type (`input_text`, `input_audio`, `item_reference`, `text`).  
+The content type (`input_text`, `input_audio`, `item_reference`, `text`, `audio`).  
 The default value is `input_text`.
 
 ```yaml

Public/Realtime/Add-RealtimeSessionItem.ps1

@@ -45,7 +45,8 @@ function Add-RealtimeSessionItem {
             'input_text',
             'input_audio',
             'item_reference',
-            'text'
+            'text',
+            'audio'
         )]
         [ValidateNotNullOrEmpty()]
         [string]$ContentType = 'input_text',