Improve '--update' docstring (#7167)
Improve '--update' docstring (#7167)

* update --update docstring

* update --update docstring

Co-authored-by: czoido <2accafae6a9d696f958aa2dba27077cd7a20a336@gmail.com>
conan-io/conan,conan-io/conan,conan-io/conan