Fix typo in async.md (#747)

diff --git a/docs/async.md b/docs/async.md
index 7cd2d0d5d1e0ae535fc83d3884f16676a6750345..3fd5647aa89eeb118fca427844ee4ae791faa252 100644 (file)
--- a/docs/async.md
+++ b/docs/async.md
@@ -82,7 +82,7 @@ The async response streaming methods are:
 
 ### Streaming requests
 
-When sending a streaming request body with an `AsyncClient` instance, you should use an async butes generator instead of a bytes generator:
+When sending a streaming request body with an `AsyncClient` instance, you should use an async bytes generator instead of a bytes generator:
 
 ```python
 async def upload_bytes():