Heinrich Schuchardt a6aaeb2a91 doc: fix doc/develop/logging.rst
Sphinx 3 builds fail due to doc/develop/logging.rst producing duplicate
labels.

Include logging.h only once in the API section and use cross-references for
the enums log_level_t and log_category_t.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2021-01-27 12:52:57 +01:00
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