@b0rk Great work. This reads well and I am very happy to see progress on improving these docs in general. The Git docs tend to drive me mad and sometimes I even end up reading Git's code instead to find the answers I need.
I noticed that the distinction between author and committer is left somewhat unclear. Perhaps this was done on purpose? Could the difference even be described succinctly? I believe some git operations care about the difference while some other operations do not 
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