fix: corrected French translations in Markdown guide and i18n file

[anassgallass]

What problem does this PR solve?

This PR improves the quality and accuracy of French translations in the Hugo Blog Awesome project. It corrects typos, adjusts grammar, and enhances the clarity of the Markdown guide and other translation-related content in the following files:

• exampleSite/content/fr/posts/markdown-syntax/index.md: Adjusted grammar and improved wording for the Markdown Syntax Guide.
• exampleSite/hugo.toml: Ensured French language settings are accurate and consistent.
• i18n/fr-fr.yaml: Fixed typos and refined wording for better translation accuracy.

Is this PR adding a new feature?

No, this PR does not add a new feature. It focuses on refining the existing French translations.

Is this PR related to any issue or discussion?

No specific issue is linked to this PR.

PR Checklist

• I have verified that the code works as described/as intended.
• This change adds a social icon which has a permissive license to use it.
• This change does not include any external library/resources.
• This change does not include any unrelated scripts (e.g. bash and python scripts).
• I have enabled maintainer edits for this PR.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[anassgallass]

Hi @hugo-sid !
I recently submitted a pull request that corrects and improves the French translations in the project. The changes have passed all automated tests. I would greatly appreciate it if you could take a moment to review it.
Thank you for your time and for maintaining this amazing project!

[hugo-sid]

Thank you for the improvements @anassgallass.

Happy blogging!