a83c222362
In 3eb809dd03 the max width of the page
was set to 900px, but the REST API example boxes were still set with
a fixed width of 100em which caused them to extend out to the right
of the page.
Remove the fixed width of the box, and set "overflow: auto". This
makes the boxes fit within the page width, with a horizontal scroll
bar on the ones that have wider content.
Change-Id: I6f64c314e4eb484d9c5120fd0fd5589fcaa8b77e