fixed up docs

Author: David Motsonashvili

firebase-ai/src/main/kotlin/com/google/firebase/ai/FirebaseAI.kt

@@ -212,7 +212,7 @@ internal constructor(
   }
 
   public companion object {
-    /** The [FirebaseAI] instance for the default [FirebaseApp] */
+    /** The [FirebaseAI] instance for the default [FirebaseApp] using the Google AI Backend. */
     @JvmStatic
     public val instance: FirebaseAI
       get() = getInstance(backend = GenerativeBackend.googleAI())
@@ -232,7 +232,7 @@ internal constructor(
       return multiResourceComponent.get(backend)
     }
 
-    /** Returns the [FirebaseAI] instance for the provided [FirebaseApp] */
+    /** The [FirebaseAI] instance for the provided [FirebaseApp] using the Google AI Backend. */
     @JvmStatic public fun getInstance(app: FirebaseApp): FirebaseAI = getInstance(app)
 
     private const val GEMINI_MODEL_NAME_PREFIX = "gemini-"
@@ -243,14 +243,14 @@ internal constructor(
   }
 }
 
-/** Returns the [FirebaseAI] instance of the default [FirebaseApp]. */
+/** The [FirebaseAI] instance for the default [FirebaseApp] using the Google AI Backend. */
 public val Firebase.ai: FirebaseAI
   get() = FirebaseAI.instance
 
 /**
  * Returns the [FirebaseAI] instance for the provided [FirebaseApp] and [backend].
  *
- * @param backend the backend reference to make generative AI requests to. .
+ * @param backend the backend reference to make generative AI requests to.
  */
 public fun Firebase.ai(
   app: FirebaseApp = Firebase.app,

firebase-ai/src/main/kotlin/com/google/firebase/ai/FirebaseAIMultiResourceComponent.kt

@@ -37,18 +37,18 @@ internal class FirebaseAIMultiResourceComponent(
   private val internalAuthProvider: Provider<InternalAuthProvider>,
 ) {
 
-  @GuardedBy("this") private val aiInstances: MutableMap<String, FirebaseAI> = mutableMapOf()
+  @GuardedBy("this") private val instances: MutableMap<String, FirebaseAI> = mutableMapOf()
 
   fun get(backend: GenerativeBackend): FirebaseAI =
     synchronized(this) {
-      aiInstances[backend.location]
+      instances[backend.location]
         ?: FirebaseAI(
             app,
             backend,
             blockingDispatcher,
             appCheckProvider,
             internalAuthProvider,
           )
-          .also { aiInstances[backend.location] = it }
+          .also { instances[backend.location] = it }
     }
 }