Fix syntax in ApiKeyDialog.kt and update InfoText in MenuScreen.kt

Author: Android-PowerUser

app/src/main/kotlin/com/google/ai/sample/ApiKeyDialog.kt

@@ -120,15 +120,13 @@ fun ApiKeyDialog(
                         .fillMaxWidth()
                         .padding(bottom = 16.dp)
                 ) {
-                } {
                     val buttonText = if (selectedProvider == ApiProvider.PUTER) {
                         "Get Auth Token for Puter"
                     } else {
                         "Get API Key for ${selectedProvider.name.replaceFirstChar { it.uppercase() }}"
                     }
                     Text(buttonText)
                 }
-                }
 
                 // Input and Add section
                 Row(verticalAlignment = Alignment.CenterVertically) {