Humor markdownlint in Contributing.md

[unixorn]

Description

Add missing blank line before H2 heading in Contributing.md

Type of changes

• Adds/updates a helper script
• Adds/updates a link to an external resource like a blog post or video
• Text change (fix typos, update formatting)
• Test changes

Copyright Assignment

• This repository is covered by the Apache License, and I agree to contribute this PR under the terms of that license.

Checklist

• All new and existing tests pass.
• I have signed off my commits. You can use git commit --amend --no-edit --signoff to amend an existing commit, and you can find more details about signing off commits on the DCO GitHub action page here
• Any scripts added/updated use #!/usr/bin/env interpreter instead of direct paths. #!/bin/sh is an allowed exception.
• Scripts added/updated are marked executable
• I have added/updated a credit line to README.md for any scripts added or updated in this PR.
• If there was no author credit in a script added in this PR, I have added one.
• I have confirmed that the link(s) in this PR are valid.
• I have read the CONTRIBUTING page.

[codeclimate]

Code Climate has analyzed commit ab1d9ed and detected 0 issues on this pull request.

View more on Code Climate.

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.05s
✅ COPYPASTE	jscpd	yes		no	1.56s
✅ MARKDOWN	markdownlint	1		0	0.69s
✅ MARKDOWN	markdown-table-formatter	1		0	0.32s
⚠️ REPOSITORY	checkov	yes		3	26.77s
✅ REPOSITORY	dustilock	yes		no	0.08s
✅ REPOSITORY	gitleaks	yes		no	0.58s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	10.36s
✅ REPOSITORY	kics	yes		no	17.71s
✅ REPOSITORY	secretlint	yes		no	1.51s
✅ REPOSITORY	syft	yes		no	0.5s
✅ REPOSITORY	trivy	yes		no	4.23s
✅ REPOSITORY	trivy-sbom	yes		no	2.22s
✅ REPOSITORY	trufflehog	yes		no	4.62s
✅ SPELL	lychee	2		0	0.1s
⚠️ YAML	prettier	1		1	0.82s
✅ YAML	v8r	1		0	2.74s
❌ YAML	yamllint	1		1	0.93s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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