Fixesopenssl/openssl#11748
find-doc-nits: Check for duplicate options
Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27088)
(cherry picked from commit 2c8103e468fa6463ef503a3dd8e6e20d1b1afec9)