d13665888829101a1c85e2557f935358e16b6173
Move `signoff` out of the 'external' subsection as the script [got
replaced by the native way][1].
Update 'external' subsection's comment as it does not contain only zsh
functions.
[1]: bb21c4df7844 ("git: Replace git-signoff with `rebase --signoff`")
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