Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/85876a536a9a
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #16632 from eeejay/bug-976684

Bug 976684 - [Settings] Fix typo in screen reader start button label.

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https://hg.mozilla.org/integration/gaia-central/rev/825b9264f2ac
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 976684 - [Settings] Fix typo in screen reader start button label. r=kaze

b2g/config/gaia.json

@@ -1,4 +1,9 @@
 {
-    "revision": "d9c0618194e0272b7dc57dc9dfd1787adc542c5b", 
+    "git": {
+        "remote": "", 
+        "branch": "", 
+        "revision": ""
+    }, 
+    "revision": "85876a536a9a699f9e6d1af118605cd53ca14f56", 
     "repo_path": "/integration/gaia-central"
 }