feat: Add limitations to Auto-edit feature documentation

- Clarify that Auto-edit suggestions are limited to a fixed number of lines around the cursor
- Document that Auto-edit may not propose all necessary changes in complex refactoring scenarios
- Explain that manual deletion or cleanup of code may still be required in some cases
- Note that Auto-edit suggestions may not cover all similar instances of code that could be changed

Author: jdorfman

docs/cody/capabilities/auto-edit.mdx

@@ -79,5 +79,6 @@ Auto-edit:
 
 - 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
 - Suggestions may not cover all similar instances of code that could be changed