Fixed doxygen parameters names

[tesseract241]

Summary

Fixes the current codebase failing Doxygen generation due to function parameter names and Doxygen parameter names being different.

Tests

None.

Side Effects

None.

Release notes

Doxygen docs will be correctly generated.

Checklist

• Copyright holder: myself, tesseract241

  The copyright holder is typically you or your assignee, such as a university or company. By submitting this pull request, the copyright holder is agreeing to the license the submitted work under the following licenses:
  - Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
  - Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

• the basic tests are passing
  For completeness I did run all the listed tests, they passed.

  • unit tests pass (to run, use: ./runTests.py test/unit)
  • header checks pass, (make test-headers)
  • dependencies checks pass, (make test-math-dependencies)
  • docs build, (make doxygen)
  • code passes the built in C++ standards checks (make cpplint)

• the code is written in idiomatic C++ and changes are documented in the doxygen
  No code was changed, only comments.

• the new changes are tested
  No code was changed, only comments.

[WardBrian]

Thanks!