Revert doc change to AdbCommands.Push.

google#8 wasn't merged yet.

Author: maruel

adb/adb_commands.py

@@ -133,11 +133,10 @@ def Install(self, apk_path, destination_dir=None, timeout_ms=None):
                       timeout_ms=timeout_ms)
 
   def Push(self, source_file, device_filename, mtime='0', timeout_ms=None):
-    """Push a file or directory to the device.
+    """Push a file to the device.
 
     Arguments:
-      source_file: Either a filename, a directory or file-like object to push to
-                   the device.
+      source_file: Either a filename or file-like object to push to the device.
       device_filename: The filename on the device to write to.
       mtime: Optional, modification time to set on the file.
       timeout_ms: Expected timeout for any part of the push.