Fix docs: update Italy docstring

[arkid15r]

Proposed change

Fix sphinx.errors.SphinxWarning: /Users/ark/Dev/python-holidays/holidays/countries/italy.py:docstring of holidays.countries.italy.Italy:3:Inline interpreted text or phrase reference start-string without end-string. error that I was getting locally.

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[KJhellico]

LGTM.