Changed pipeing to piping

Author: tleonhardt

docs/transcript.rst

@@ -29,7 +29,7 @@ This is by far the easiest way to generate a transcript.
 .. warning::
 
    Make sure you use the **poutput()** method in your ``cmd2`` application for generating command output.  This method
-   of the ``cmd2.Cmd`` class ensure that output is properly redirected when redirecting to a file, pipeing to a shell
+   of the ``cmd2.Cmd`` class ensure that output is properly redirected when redirecting to a file, piping to a shell
    command, and when generating a transcript.
 
 Manually