doc: doxyfile: upgrade to 1.9.1

Doxyfile has been upgraded using `doxygen -u doc/zephyr.doxyfile.in`.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
This commit is contained in:
Gerard Marull-Paretas 2021-10-03 18:41:09 +02:00 committed by Anas Nashif
parent bed8f352e4
commit 5c5f7bb7d2

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