update output description

Author: shenxianpeng

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -60,7 +60,8 @@ body:
       label: Output
       description: >-
         Provide the output of the steps above, including the commands
-        themselves and pip's output/traceback etc.
+        themselves and pip's output/traceback etc. 
+        (The output will auto-rendered as code, no need for backticks.)
 
         If you want to present output from multiple commands, please prefix
         the line containing the command with `$ `. Please also ensure that