Javadoc fix: add literal in mail addresses

[rolnico]

Please check if the PR fulfills these requirements

• [X] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem? Same as https://github.com/powsybl/powsybl-core/pull/2753

What kind of change does this PR introduce? Javadoc update

What is the current behavior? Mail addresses were written as @author Name Surname <author at email.address>

What is the new behavior (if this is a feature change)? Mail addresses are written as @author Name Surname {@literal <author at email.address>}

Does this PR introduce a breaking change or deprecate an API?

• [ ] Yes
• [X] No

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud