Add missing documentation for `SourceChanged`
Add missing documentation for `SourceChanged`

ppy/osu,peppy/osu,NeoAdonis/osu,peppy/osu,ppy/osu,smoogipoo/osu,smoogipooo/osu,peppy/osu-new,smoogipoo/osu,peppy/osu,NeoAdonis/osu,smoogipoo/osu,NeoAdonis/osu,ppy/osu