update FAQ,

98_AI_workspace/software-engineer/010_FAQ.md

@@ -32,3 +32,17 @@ A: You only need to update the comment with same format and detail levels of the
 
 Q: which command should i use for check git stage ?
 A: `git status . ` to avoid hanging in the terminal
+
+Q: what is the example of `top comment` ?
+A: please refer to markdown below:
+
+```markdown
+// <file-path, starting from `src`>
+//
+// PURPOSE:
+// - T.B.A. (Clear PURPOSE section with bullet points)
+//
+// RULES:
+// - T.B.A. (Clear RULES section with bullet points)
+//
+```