doc: Remove redundant include line in documentation
doc: Remove redundant include line in documentation

stdint was added to inline doc in 2019 and to main doc in 2020, but with
that accidentally to the header file again.

Fixes: 8d99418ef64c ("include: Change from should to must and add stdint.h")
Fixes: e31967fbedc7 ("doc: Add stdint.h to headers")
Signed-off-by: Alexander Dahl <e4ea294c062c525643df036a35ca579b905fa400@thorsis.com>
Reviewed-by: Andreas Schneider <5be00ddc76278cf6077f5047ca3384a88460c671@cryptomilk.org>
clibs/cmocka,clibs/cmocka