Fix change detection for docs build
Fix change detection for docs build

When we change the tutorials, this should trigger a rebuild of the
docs.  The full list of source files for the docs is now correct, so
changes to any of them will trigger a rebuild of the docs.

Change-Id: I2328e592237735e41508e8bb984d062e687c8104

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