license.md file in tree view is incorrectly marked with certificate symbol

Summary

Nothing problematic, but a little UI weirdness (unless it's intended here?):

Steps to reproduce

1. Go to https://gitlab.com/gitlab-org/gitlab/-/tree/4c78cc58b5eb4f47c8d917e77a091c00014f9a43/doc/api (or current master)
2. Scroll down to license.md file

Example Project

See 1. above

What is the current bug behavior?

The certificate file icon/symbol is used.

What is the expected correct behavior?

The markdown file icon/symbol is used.

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes