(docs) add async embeddings

docs/my-website/docs/embedding/async_embedding.md

@@ -0,0 +1,15 @@
+# Async Embedding
+
+LiteLLM provides an asynchronous version of the `embedding` function called `aembedding`
+### Usage
+```python
+from litellm import aembedding
+import asyncio
+
+async def test_get_response():
+    response = await aembedding('text-embedding-ada-002', input=["good morning from litellm"])
+    return response
+
+response = asyncio.run(test_get_response())
+print(response)
+```

docs/my-website/sidebars.js

@@ -46,7 +46,11 @@ const sidebars = {
     {
       type: "category",
       label: "Embedding() & Moderation()",
-      items: ["embedding/supported_embedding", "embedding/moderation"],
+      items: [
+        "embedding/supported_embedding", 
+        "embedding/async_embedding",
+        "embedding/moderation",
+      ],
     },
     {
       type: "category",