docs(ui): Correct receiver IDs in the UI tutorial
docs(ui): Correct receiver IDs in the UI tutorial

Closes #2926

Change-Id: If535dc03f585ba3d7b6b504454dc920e822aabc4

shaka-project/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player