bit fields not recognized when defined in a file specified by @custom_section_begin

[cng18]

Describe the bug One particular file has code for many registers. I wanted to capture the bitfield descriptions in a separate file and wanted the documenter to read that file. For this I used the doxygen tag @custom_section_begin. Documenter does not convert the bitfield descriptions.

To Reproduce Code to reproduce the error.

Code Code to reproduce the error.

Please complete the following information:

• OS: Windows 11
• VSCode version 1.67.0-insider

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