Correct misspelling of "separate" in two places.

This closes SF bug #476898.

Doc/mac/using.tex

@@ -207,7 +207,7 @@ a class browser, a graphical debugger, and more.
 Use this window like you would the \program{PythonInterpreter}, except
 that you cannot use the ``Drag and drop'' method above. Instead,
 dropping a script onto the \program{Python IDE} icon will open the
-file in a seperate script window (which you can then execute manually
+file in a separate script window (which you can then execute manually
 -- see section \ref{IDEexecution}).
 
 
@@ -262,7 +262,7 @@ saving it as an ``applet'' (by selecting ``Save as applet'' from the
 files or folders onto it, to pass them to the applet the way
 command-line users would type them onto the command-line to pass them
 as arguments to the script. However, you should make sure to save the
-applet as a seperate file, do not overwrite the script you are
+applet as a separate file, do not overwrite the script you are
 writing, because you will not be able to edit it again.
 
 Accessing the items passed to the applet via ``drag-and-drop'' is done