Add one blank line before code block

Signed-off-by: Arthit Suriyawongkul <arthit@gmail.com>

Author: bact

tools/listing.py

@@ -30,7 +30,8 @@ def listing_md(listing: dict[str, Any]) -> str:
     output: list[str] = []
     output.append(f"- ### {link_md(listing['title'], os.path.join(listing['path']))}")
     output.append(f"  {listing['description']}{contributors}")
-    output.append("\n   ```shell")
+    output.append("")
+    output.append("   ```bash")
     for index, task in enumerate(listing["tasks"]):
         if index > 3:
             break
@@ -98,6 +99,7 @@ def generate_options(task_metadata: dict[str, Any]) -> None:
     contents.append(
         "You can control a variety of options from the command line. For example:"
     )
+    contents.append("")
     contents.append("```bash")
     contents.append(f"inspect eval inspect_evals/{task_names[0]} --limit 10")
     contents.append(f"inspect eval inspect_evals/{task_names[1]} --max-connections 10")
@@ -118,6 +120,7 @@ def generate_usage(task_metadata: dict[str, Any]) -> None:
     contents.append(
         "First, install the `inspect_ai` and `inspect_evals` Python packages with:"
     )
+    contents.append("")
     contents.append("```bash")
     contents.append("pip install inspect_ai")
     if dependency is None:
@@ -132,6 +135,7 @@ def generate_usage(task_metadata: dict[str, Any]) -> None:
     contents.append("")
 
     contents.append("Then, evaluate against one or more models with:")
+    contents.append("")
     contents.append("```bash")
     for index, task in enumerate(task_metadata["tasks"]):
         if index > 3: