[Safari] CMD+< shortcut opens settings page

System: macOS 10.13.1
Safari: 11.0.1 (but is not exclusive to this version)

I am on a german keyboard and `cmd+<` is a macOS system-wide shortcut to switch between windows of the current app. On Chrome and Firefox, this works as expected, but in Safari, Devdocs seems to listen for this shortcut, which opens the settings page.

The shortcut from the document (`strg+,`) also works, so the extra shortcut is not needed and removing it would result in the expected behavior of the browser.

Start by locating the keyboard-shortcut handling for the settings page and the documented shortcut mentioned in the issue. Reproduce the behavior in Safari with a German keyboard layout, then verify that the extra CMD+< shortcut no longer opens settings while the documented shortcut still works.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.