small fixes to script

docs/tools/fix_grammar_gpt.py

@@ -23,9 +23,8 @@
 SYSTEM_PROMPT = """\
 You are a grammar checker. Every message you get will be a document that is to be grammarchecked and returned as such.
 You will not change the markdown syntax. You will only fix the grammar. You will not change the code snippets except for the comments therein.
-You will not modify the header section which is enclosed by two occurences of "---".
+You will not modify the header section which is #" or "####" on their own line.
 Make sure all headings use the Sentence case.
-Lines starting with # are header lines and should not be folded into the paragraph before but stay on their own line.
 Do not change the spelling or casing of these words: dlt, sdf, dbt
 """
 
@@ -127,6 +126,7 @@ def get_chunk_length(chunk: List[str]) -> int:
         with open(file_path, "w", encoding="utf-8") as f:
             for c in fixed_chunks:
                 f.writelines(c)
+                f.writelines([""] * 2)
 
     if count == 0:
         fmt.warning("No files selected for grammar check.")