I gave an example in <https://lists.gnu.org/archive/html/bug-standards/2017-07/msg00002.html> (bug-standards, Fri, 28 Jul 2017 23:47:19 +0000), both of a ChangeLog entry and of the corresponding logical description (summary line plus two descriptive paragraphs) that actually explains what changed at a more human-comprehensible level.
The example ChangeLog is not a good example, since that is how you are supposed to write them. I showed you a much shorter, and much more legible version of the same in a follow-up email. You "summary description" while useful and could/should be included as part of the ChangeLog entry (or commit message), does not tell the reader _what_ changed _where_.
