Merge branch 'eread/turn-on-link_fragments-markdownlint-check' into 'master'

Turn on link-fragments Markdownlint check

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/145471



Merged-by: Kati Paizee <kpaizee@gitlab.com>
Approved-by: Kati Paizee <kpaizee@gitlab.com>
Approved-by: Diana Logan <dlogan@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>

.markdownlint.yml

@@ -16,7 +16,6 @@ header-style:                     # MD003
 hr-style:                         # MD035
   style: "---"
 line-length: false                # MD013
-link-fragments: false             # MD051
 no-duplicate-heading:             # MD024
   siblings_only: true
 no-emphasis-as-heading: false     # MD036