Merge "docs: Fixed broken link to "Picture-in-Picture" training guide within...

Merge "docs: Fixed broken link to "Picture-in-Picture" training guide within "Multi-Window Support" page." into nyc-dev am: de85f4d0 am: 9c2b6ace am: d3647100 am: 62c89396
am: 241f5f9f

Change-Id: I26bb4acf2a5b6556857b6492b7d8342caab1dfd4