chore: add candidateCount to the Gemini model config parameters (#656)

Author: thatfiredev

firebase-ai/app/src/main/java/com/google/firebase/example/ailogic/java/GoogleAISnippets.java

@@ -50,8 +50,10 @@ public void modelConfiguration_model_parameters_general() {
     // [START model_parameters_general]
     // ...
 
-    // Set parameter values in a `GenerationConfig` (example values shown here)
+    // Set parameter values in a `GenerationConfig`.
+    // IMPORTANT: Example values shown here. Make sure to update for your use case.
     GenerationConfig.Builder configBuilder = new GenerationConfig.Builder();
+    configBuilder.candidateCount = 1;
     configBuilder.maxOutputTokens = 200;
     configBuilder.stopSequences = List.of("red");
     configBuilder.temperature = 0.9f;

firebase-ai/app/src/main/java/com/google/firebase/example/ailogic/java/VertexAISnippets.java

@@ -51,8 +51,10 @@ public void modelConfiguration_model_parameters_general() {
     // [START model_parameters_general]
     // ...
 
-    // Set parameter values in a `GenerationConfig` (example values shown here)
+    // Set parameter values in a `GenerationConfig`.
+    // IMPORTANT: Example values shown here. Make sure to update for your use case.
     GenerationConfig.Builder configBuilder = new GenerationConfig.Builder();
+    configBuilder.candidateCount = 1;
     configBuilder.maxOutputTokens = 200;
     configBuilder.stopSequences = List.of("red");
     configBuilder.temperature = 0.9f;

firebase-ai/app/src/main/java/com/google/firebase/example/ailogic/kotlin/GoogleAISnippets.kt

@@ -42,8 +42,10 @@ class GoogleAISnippets : ViewModel() {
     // [START model_parameters_general]
     // ...
 
-    // Set parameter values in a `GenerationConfig` (example values shown here)
+    // Set parameter values in a `GenerationConfig`.
+    // IMPORTANT: Example values shown here. Make sure to update for your use case.
     val config = generationConfig {
+      candidateCount = 1
       maxOutputTokens = 200
       stopSequences = listOf("red")
       temperature = 0.9f

firebase-ai/app/src/main/java/com/google/firebase/example/ailogic/kotlin/VertexAISnippets.kt

@@ -43,8 +43,10 @@ class VertexAISnippets : ViewModel() {
     // [START model_parameters_general]
     // ...
 
-    // Set parameter values in a `GenerationConfig` (example values shown here)
+    // Set parameter values in a `GenerationConfig`.
+    // IMPORTANT: Example values shown here. Make sure to update for your use case.
     val config = generationConfig {
+      candidateCount = 1
       maxOutputTokens = 200
       stopSequences = listOf("red")
       temperature = 0.9f