Update comments (Feature Request #11 on Sourceforge)

[pniedzielski]

Copied verbatim from https://sourceforge.net/p/doxymacs/feature-requests/11/

Please take a look at this demo

http://nschum.de/src/emacs/doc-mode/screencast/
http://nschum.de/src/emacs/doc-mode/

Personally, I think the update command is very useful for the documentation. Hopefully doxymacs could have this ability.

Thanks a lot for the hard work on this project.

[pniedzielski]

I am copying open issues from the old Sourceforge repo. I haven't looked into this yet, so it may not be worth doing, but we can close this issue then.