Correct short options for --formats and --fontName in help

[juliangilbey]

Summary

The output of webfont --help currently includes -f, --fontName and -r, --formats, but these don't match the definitions later in the file, so -f myfont produces no output (as myfont is not a valid format). This patch corrects the help message to match the definitions.

How to test

Describe the tests that you ran to verify your changes:

1. Run webfont --help.
2. Check if the lines now read -u, --fontName and -f, --formats

Checklist

• I have added corresponding labels to this PR (like bug, enhancement...);
• My commits follow the Conventional Commits 1.0 Guidelines;
• My code follows the style guidelines of this project;
• I have performed a self-review of my own code;
• I have mapped technical debts found on my changes;
• I have made changes to the documentation (if applicable);
• My changes generate no new warnings or errors;