updated comment formatting for correct doxygen generation

[MikeWrock]

Description

The Doxygen documentation is generated incorrectly due to incorrect comment syntax. This PR corrects the issue

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[MikeWrock]

This newline causes the doxygen formatting to look bad for VALID_INITIALIZATION_METHODS, but I'm not sure how to fix it without disabling clang for that section. I can leave it as is, or disable formatting for that line

[codecov]

Codecov Report

Base: 51.11% // Head: 51.11% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (bc08e40) compared to base (e960047).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1582      +/-   ##
==========================================
- Coverage   51.11%   51.11%   -0.00%     
==========================================
  Files         380      380              
  Lines       31796    31796              
==========================================
- Hits        16250    16249       -1     
- Misses      15546    15547       +1     

Impacted Files	Coverage Δ
...nning_scene_monitor/src/planning_scene_monitor.cpp	45.29% <0.00%> (-0.43%)	⬇️
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	76.43% <0.00%> (+1.08%)	⬆️

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