Re: [PATCH v7 5/5] doc: git-rebase: update discussion of internals

"Julia Evans via GitGitGadget" [off-list ref] writes:

+Here is a simplified description of what `git rebase <upstream>` does:
+
+1. Make a list of all new commits on your current branch since it branched
+   off from `<upstream>`. This is the same set of commits that would be shown
+   by `git log  <upstream>..HEAD`. You can use `--fork-point` or  `--root` to
+   change how this list of commits is constructed.
+2. Check whether any of those commits contain the same changes (according to
+   `git patch-id`) as a commit already in `<upstream>` and remove them from
+   the list.

I'd suggest three things

 * Rewrite the introductory text to

    Here is what "git rebase <upstream> [<branch>]" conceptually does:

 * Add step 0. to make "your current branch" in the next step valid.

    0. When <branch> is given, check it out and make it your current
    branch.

 * Combine the steps 1 & 2. and stop talking about "git log" whose
   invocation cannot be precisely described here anyway.

Other than that, the remainder of the series (v7 [1-4/5]) looked
good.

THanks.