Suggestion: Include links for both handbooks
In Musescore 3.0.0, Help > Online Handbook still points to Handbook 2. Handbook 3 is at https://musescore.org/en/handbook-3.
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.0.0.4785, revision: c1a5e4c