docs: Update embedding examples from gemini-embedding-2-preview to gemini-embedding-2

PiperOrigin-RevId: 1014120458

Author: google-genai-bot

google/genai/models.py

@@ -5737,7 +5737,7 @@ def embed_content(
       )
 
       multimodal_embeddings = client.models.embed_content(
-          model='gemini-embedding-2-preview',
+          model='gemini-embedding-2',
           contents=[
               types.Part.from_uri(
                   file_uri='gs://generativeai-downloads/images/scones.jpg',
@@ -8928,7 +8928,7 @@ async def embed_content(
       )
 
       multimodal_embeddings = await client.aio.models.embed_content(
-          model='gemini-embedding-2-preview',
+          model='gemini-embedding-2',
           contents=[
               types.Part.from_uri(
                   file_uri='gs://generativeai-downloads/images/scones.jpg',