Issue #2964789 by phenaproxima, capysara, J.Gayathri, webchick, seanB, samuel.mortenson, Wim Leers, xjm, balsama, katherined, mradcliffe, JeroenT, bnjmnm, starshaped, oknate, RoloDMonkey: Document the Media Library module
mentioned in commit b01f8e27
mentioned in commit 429af186