[bug #64315] [mm] document `LT SB` indentation difference from DWB 3.3 mm

Update of bug #64315 (project groff): Status: In Progress => Fixed Open/Closed:Open => Closed Planned Release:None => 1.24.0

[bug #64315] [mm] document `LT SB` indentation difference from DWB 3.3 mm

Update of bug #64315 (project groff): Summary: [mm] semi-blocked letter style uses wrong, hard-coded paragraph indentation => [mm] document `LT SB` indentation difference from DWB 3.3 mm ___ Reply to this item at: