Is diff -u better, or diff -c ? I don't care. For large-ish text changes, like this, I slightly prefer diff -c. For tiny text changes, like a single typo, I slightly prefer diff -u. But, like you, I don't feel strongly about it and will take whatever.
If you want another tiny optimization :) ... you could write the ChangeLog entries in the form in which they get committed, namely: 2015-04-22 Jim Hefferon <jheffe...@smcvt.edu> * latex2e.texi (Starting and ending): Added working minimal example. Of course, this is not a big deal either ... Really appreciate your tackling these long-overdue item. Karl