Update Documentation link for multiple screens.

Place the Google Doc into a frame that mimics the style of the App
Inventor website.

Change-Id: I4bb1b0593e1f749ddd08803b7fdd0375abd48a15
Add XML Decoding Support to the Web Component

Change-Id: I2a5b2bc22beade5fdf6a2a468484b32d6a8ed2e6