Fix incorrect doxygen comment in costmap_2d

[Ryanf55]

Description of contribution in a few bullet points

• Fix incorrect doxygen comment naming params that don't exist.

For Maintainers:

• [ ] Check that any new parameters added are updated in docs.nav2.org
• [ ] Check that any significant change is added to the migration guide
• [ ] Check that any new features OR changes to existing behaviors are reflected in the tuning guide
• [ ] Check that any new functions have Doxygen added
• [ ] Check that any new features have test coverage
• [ ] Check that any new plugins is added to the plugins page
• [ ] If BT Node, Additionally: add to BT's XML index of nodes for groot, BT package's readme table, and BT library lists

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
..._costmap_2d/include/nav2_costmap_2d/costmap_2d.hpp	100.00% <ø> (ø)

... and 1 file with indirect coverage changes