Remove requirement for initial character edit in auto-edit feature

This change removes the requirement for at least one character edit in the codebase before auto-edit suggestions become active. This simplifies the user experience and allows the feature to provide suggestions immediately upon enabling.

Author: jdorfman

docs/cody/capabilities/auto-edit.mdx

@@ -59,7 +59,6 @@ The auto-edit feature can help you with various repetitive tasks in your code:
 
 ## Known limitations
 
-- Requires at least one character edit in the codebase before suggestions become active
 - May not propose all necessary changes in complex refactoring scenarios, requiring some manual edits
 - Suggestions are limited to a fixed number of lines around the cursor
 - Sometimes requires manual deletion or cleanup of code