fix(docstrings): add blank line before example

[kehan-zhou]

🛠️ What This Fix Does
Previously, it did not render some docstrings correctly. This was due to missing blank lines between the summary and the Example: section, causing Example: blocks to not display properly in the generated documentation.

This fix adds the required blank line after the summary in affected docstrings, ensuring it renders the examples correctly.

This improves documentation readability and ensures consistency across the project.

📌 Related Issue
Fixes #5032

[terriko]

Looks like you've got a couple of flake8 errors:

 cve_bin_tool/cve_scanner.py:67:1: W293 blank line contains whitespace
cve_bin_tool/helper_script.py:218:17: W291 trailing whitespace

Running black on those two files will likely fix it, but I've also manually added fixes that you can probably just accept if you don't have black set up.

More on our linters and how to set them up here if you need it: https://github.com/intel/cve-bin-tool/blob/main/CONTRIBUTING.md#running-linters

[kehan-zhou]

I've run black and pushed a new commit to fix the flake8 warnings — thank you for the helpful and friendly review.

[terriko]

Looks like this is ready to merge. Thank you again for the fix! (and to @jloehel for pointing out that we needed it)