Bug 875562 - Part 1: Document existing crash reporter behavior; r=bsmedberg

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extra : rebase_source : f78175cce67a7c239ddce1b2ddac17ddf1b04a8a
extra : amend_source : ef0500530b6c27ece12038345334fac059af820c
extra : histedit_source : e2dce3662b45720deed2fab34b2da66af9e23eae