docs: Clarify Live API START/END_SENSITIVITY_HIGH/LOW defaults are different in Gemini Live and Gemini Enterprise Agent Platform Live API

Fixes #2555

PiperOrigin-RevId: 930735639

Author: yinghsienwu

Google.GenAI/types/EndSensitivity.cs

@@ -34,7 +34,8 @@ private EndSensitivity(string value) {
     }
 
     /// <summary>
-    /// The default is END_SENSITIVITY_LOW.
+    /// The default is END_SENSITIVITY_LOW for Gemini Enterprise Agent Platform and
+    /// END_SENSITIVITY_HIGH for Gemini Live.
     /// </summary>
     public static EndSensitivity EndSensitivityUnspecified {
       get;

Google.GenAI/types/StartSensitivity.cs

@@ -34,7 +34,8 @@ private StartSensitivity(string value) {
     }
 
     /// <summary>
-    /// The default is START_SENSITIVITY_LOW.
+    /// The default is START_SENSITIVITY_LOW for Gemini Enterprise Agent Platform and
+    /// START_SENSITIVITY_HIGH for Gemini Live.
     /// </summary>
     public static StartSensitivity StartSensitivityUnspecified {
       get;