The "also" sounds as if "preserve" does a rebase as an additional
step that "true" would not do, but that is not the case. Clarify
this by omitting "also", and rewording the sentence a bit.
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
was rebased since last fetched, the rebase uses that information
to avoid rebasing non-local changes.
+
-When preserve, also rebase the current branch on top of the upstream
-branch, but pass `--preserve-merges` along to `git rebase` so that
-locally created merge commits will not be flattened.
+When set to preserve, rebase with the `--preserve-merges` option passed
+to `git rebase` so that locally created merge commits will not be flattened.
+
When false, merge the current branch into the upstream branch.
+