It's much more convenient to open a web browser and go to gnu.org than
writing to the FSF.

It is legally correct to do this change, see:
https://mail.gnome.org/archives/foundation-list/2016-September/msg00003.html
"Re: GPLv2/LGPLv2.1: link to gnu.org instead of FSF address?"

Done with the smart-c-comment-substitution and multi-line-substitution
scripts available at:
https://github.com/swilmet/gnome-c-utils