The help text for digital signatures has only instructions for Linux. Windows and macOS are missing.
Apparently there is some instruction for Windows, it's just not visible in the Wiki.
No instructions for Mac so this part is valid.
Katarina Behrens committed a patch related to this issue.
It has been pushed to "master":
tdf#105606: Clarify access to X509 certificate storage
A polite ping to Katarina Behrens (CIB): is this bug fixed? if so, please close it as RESOLVED FIXED
Offline help is fixed. I've no idea about online help