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

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https://hg.mozilla.org/integration/gaia-central/rev/34769c5ab47b
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #15750 from gasolin/jsdoc

Bug 950080 - add jsdoc generator to gaia, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/9737112a204c
Author: gasolin <gasolin@gmail.com>
Desc: Bug 950080 - add jsdoc generator to gaia

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "cbab228dbf95fe790e603ca8d81f5a6db26241c3", 
+    "revision": "34769c5ab47b95fe97fa0fe65e7e3a34f47b3f90", 
     "repo_path": "/integration/gaia-central"
 }