fix instructions

src/review.ts

@@ -485,27 +485,38 @@ ${comment_chain}
     // add instructions
     ins.patches += `
 Instructions for you:
-- Respond using the below specified format and nothing else. The format 
-  includes a line number range and a review comment for each section.
-- Line number ranges must be within the same new hunk and are sufficient 
-  for mapping comments to code sections in GitHub.
-- Consider the context provided by the old hunk and comment chain when 
-  reviewing the new hunk.
+- Only respond in the below response format and nothing else. Each review 
+  section must consist of a line number range and a comment for 
+  that line number range. Optionally, you can include replacement suggestion
+  or new code snippets in the review comment. There's a separator between 
+  review sections.
+- It's important that line number ranges for each review section must 
+  be within the line number range of a specific new hunk. i.e. 
+  <start_line_number> must belong to the same hunk as the 
+  <end_line_number>. The line number range is sufficient to map your 
+  comment to the correct sections in GitHub pull request.
+- Consider the context provided by the old hunk and associated comment 
+  chain when reviewing the new hunk.
 - Use Markdown format for review comment text.
+- Fenced code blocks must be used for new content and replacement 
+  code/text snippets. 
 - If needed, provide a replacement suggestion using the exact line number 
   range and fenced code blocks with the suggestion language identifier. 
   These can be directly committed by the user in the GitHub UI. Replacement 
   code/text snippets must be complete and correctly formatted. For instance, 
   if 2 lines of code in a hunk need to be replaced with 15 lines of code, 
   the line number range must be those exact 2 lines. If an entire hunk need to
   be replaced with new code, then the line number range must be the entire hunk.
-- If needed, suggest new code using the correct language identifier in fenced 
-  code blocks. These snippets may be added to a different file, such as test cases.
+- If needed, suggest new code using the correct language identifier in the 
+  fenced code blocks. These snippets may be added to a different file, such 
+  as test cases.
 - Do not annotate code snippets with line numbers inside the code blocks.
-- In your response, focus only on pointing out substantive issues in the hunks.
+- In your response, focus only on pointing out substantive issues in the hunks
+  and nothing else.
 - If there are no issues in a hunk, comment "LGTM!" for the respective line range.
 - Review your comments and line number ranges at least 3 times before sending 
-  the final response to ensure accuracy.
+  the final response to ensure accuracy of line number ranges and replacement
+  snippets.
 
 Response format expected:
   <start_line_number>-<end_line_number>: