Re: [PATCH] Note the use of "rebase -i" to squash consecutive commits into one.

This is missing sign-off.

More importantly, I do not think adding an extra illustration that starts
talking about an example history that is _different_ from what was being
discussed is a good idea.  The end result lacks coherence and forces the
reader to reset his mind for each example.

I'd suggest you to rewrite the example part that begins a few lines before
you touched.  Present the example "original" history with illustration
first (and call it A---B---C---D---E---F---G, not QRSTU), and clarify the
existing example of reordering the last 5 commits, and show the history
after such reordering.

Then you talk about squashing, with before-and-after illustrations, but
base that illustration on the same example history.  That way, the reader
has to understand the original scene only once to grok both examples.