Fixed removed_unused.py example and help for edit command

The remove_unused.py example had become outdated since the cmdenvironment command no longer exists.

The help text for the edit command was outdated since the functionality for editing previous commands got moved from the edit command to the history command.

This closes #276.
This closes #282.

1 files changed, 1 insertions, 1 deletions

diff --git a/cmd2.py b/cmd2.py
index 1c2daf7b..44f9bb1b 100755
--- a/cmd2.py
+++ b/cmd2.py
@@ -2176,7 +2176,7 @@ a..b, a:b, a:, ..b  items by indices (inclusive)
 
     @with_argument_list
     def do_edit(self, arglist):
-        """Edit a file or command in a text editor.
+        """Edit a file in a text editor.
 
 Usage:  edit [file_path]
     Where: