Documentation fails to build

Might be related to the update of doxygen to 1.13 that's currently in testing.

$ cmake --build build/ --target docs
[1/1] Generating Documentation
FAILED: docs/CMakeFiles/docs /home/carsme/repos/github.com/arrayfire/arrayfire/build/docs/CMakeFiles/docs
cd /home/carsme/repos/github.com/arrayfire/arrayfire/build/docs && /usr/bin/doxygen /home/carsme/repos/github.com/arrayfire/arrayfire/build/docs/doxygen.mk.out && cmake -E copy_directory /home/carsme/repos/github.com/arrayfire/arrayfire/build/extern/af_assets-src /home/carsme/repos/github.com/arrayfire/arrayfire/build/docs/html
warning: Tag 'HTML_TIMESTAMP' at line 1415 of file '/home/carsme/repos/github.com/arrayfire/arrayfire/build/docs/doxygen.mk.out' has become obsolete.
         To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
warning: Tag 'LATEX_TIMESTAMP' at line 2083 of file '/home/carsme/repos/github.com/arrayfire/arrayfire/build/docs/doxygen.mk.out' has become obsolete.
         To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
/home/carsme/repos/github.com/arrayfire/arrayfire/docs/pages/release_notes.md:13: warning: Reached end of file while still searching closing '}' of an alias argument (probable start: '\PR{')
/home/carsme/repos/github.com/arrayfire/arrayfire/docs/details/data.dox:45: warning: Found non-existing group 'arrafire_func' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/docs/details/vision.dox:194: warning: Found non-existing group 'homography_mat' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/algorithm.h:264: warning: Found non-existing group 'reduce_func_alltrue_by_key' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/algorithm.h:1019: warning: Found non-existing group 'reduce_func_alltrue_by_key' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/arith.h:522: warning: Found non-existing group 'explog_func_log2' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/arith.h:677: warning: Found non-existing group 'logic_func_lt' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/arith.h:1485: warning: Found non-existing group 'explog_func_log2' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/backend.h:156: warning: Found non-existing group 'unified_func_getctivebackend' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/compatible.h:128: warning: Found non-existing group 'image_func_filter' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/graphics.h:560: warning: Found non-existing group 'gfx_window_func' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/internal.h:69: warning: Found non-existing group 'internal_func_rawptr' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/internal.h:156: warning: Found non-existing group 'internal_func_rawptr' for the command '@ingroup', ignoring command
/home/carsme/repos/github.com/arrayfire/arrayfire/include/af/internal.h:187: warning: Found non-existing group 'internal_func_allocatedbytes' for the command '@ingroup', ignoring command
ninja: build stopped: subcommand failed.

cc: @lahwaacz