Update CODE_OF_CONDUCT.md (#6715)

Explicitly add "paste ChatGPT output as my own answer" as an example of unacceptable behavior

Author: cscheid

.github/CODE_OF_CONDUCT.md

@@ -35,6 +35,8 @@ Examples of unacceptable behavior include:
   address, without their explicit permission
 * Other conduct which could reasonably be considered inappropriate in a
   professional setting
+* Providing bad information by copying output from AI assistants
+  without verifying its validity
 
 ## Enforcement Responsibilities