binman: doc: Remove incomplete sentence

binman: doc: Remove incomplete sentence

This is the difference between version 1 and 2 of Massimo's patch:

binman: doc: fix reference tag placement for Logging section
v2: https://lore.kernel.org/u-boot/20230913161633.999542-1-massimo.pegorer+oss@gmail.com/
v1: https://lore.kernel.org/u-boot/20230909135235.21242-1-massimo.pegorer+oss@gmail.com/

Fixes: 0f40e23fd22 ("binman: add documentation for binman sign option")
Signed-off-by: Massimo Pegorer <massimo.pegorer+oss@gmail.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Massimo Pegorer <massimo.pegorer+oss@gmail.com>