Update Gaia API documents for #482cff85ef2fc11214464d602ea22f4e14b9e2d3
    Merge pull request #15052 from cvan/mkt-icons

Bug 944224 - Forgo data URIs for Marketplace homescreen icons, r=fabrice
(cherry picked from commit 43382bab150125ba0817f4c18e5d76d6d028e8a5)