Two-Factor Authentication documentation page is outdated - now not only Chrome [docs]

• Documents Two-Factor Authentication

New doc or update?

• New documentation
• Update existing documentation

Actual bug report

https://gitlab.com/help/user/profile/account/two_factor_authentication claims that "U2F workflow is only supported by Google Chrome at this point"

According to https://caniuse.com/#search=U2F it is supported also by Opera and Firefox (though in Firefox it is disabled by default).

It seems that https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/profile/account/two_factor_authentication.md is a relevant file.