* Update USERADD_ERROR_DYNAMIC[doc] and the first paragraph to match
the definition in meta/conf/documentation.conf.
* Add a note explaining the differences in behavior when setting
USERADD_ERROR_DYNAMIC to "warn" and "error" respectively.
[YOCTO #12932]
(From yocto-docs rev: 28cd546f3fe1eadd73ba71f9fe9a558538e69b0f)
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>