After adding some of my libraries to the library registry, I note that the automatically-generated library pages (example: https://docs.arduino.cc/libraries/keyhole/ ) are taking the repo URLs I supplied (in that case: Bitbucket ) and automatically adding .git to them. If you follow the original URL (without .git) as a hyperlink, you get to the source; however, if you add .git, the bitbucket webserver spins its wheels indefinitely while trying to populate the content.
Now, of course you could rightly argue that this is a bitbucket.org server bug rather than an arduino.cc issue. However, as a non-paying user of bitbucket I'm not going to get their support's attention, and the fact remains that it's probably wiser to just not automatically change the provided URL on the arduino.cc side, just generally to avoid any unforeseen weirdness.
I'm new here, so I'm not sure how to get arduino.cc webmasters' attention either, but I thought it would be good to raise it here.