Fix doc example for s3api put-object

The low level s3api commands don't have any custom behavior,
so we will not automatically switch over to multipart uploads for
large files.

This was reported in: aws#752

awscli/examples/s3api/put-object.rst

@@ -5,8 +5,8 @@ The following example uses the ``put-object`` command to upload an object to Ama
 
     aws s3api put-object --bucket text-content --key dir-1/my_images.tar.bz2 --body my_images.tar.bz2
 
-The put-object command automatically uses multipart upload for large files.  The following example shows an upload of a
-video file (The video file is specified using Windows file system syntax.)::
+The following example shows an upload of a video file (The video file is
+specified using Windows file system syntax.)::
 
     aws s3api put-object --bucket text-content --key dir-1/big-video-file.mp4 --body e:\media\videos\f-sharp-3-data-services.mp4