Only warn about mermaid diagram if it's changed

scripts/doc_parsing_utils.py

@@ -586,6 +586,7 @@ def replace_multiline_code_block(
 
     block_language = block_a["lang"].lower()
     if block_language in {"mermaid"}:
+        if block_a != block_b:
             print("Skipping mermaid code block replacement. This should be checked manually.")
         return block_a["content"].copy()  # We don't handle mermaid code blocks for now