Allow linking to line numbers in rendered file.
<!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal <!-- Use this section to explain the feature and how it will work. It can be helpful to add technical details, design proposals, and links to related epics or issues. --> <!-- Consider adding related issues and epics to this issue. You can also reference the Feature Proposal Template (https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Feature%20proposal%20-%20detailed.md) for additional details to consider adding to this issue. Additionally, as a data oriented organization, when your feature exits planning breakdown, consider adding the `What does success look like, and how can we measure that?` section. --> Like https://gitlab.com/gitlab-org/gitlab/-/merge_requests/91810 provides for code, I would like to be able to link to specific lines in rendered Markdown files. An example of a real use case would be me wanting to link to https://gitlab.com/rokejulianlockhart/rokejulianlockhart/-/blob/27f4161caed95f549a25f253682e52198d1e6ec9/readMe.MD?plain=1#L75-79, rendered, so that I can use that URI in links at https://app.dub.co/rokejulianlockhart?showArchived=true&search=KWTsOXP (like https://dub.sh/KWTsOXP in all of my other profiles' biography sections). I am aware that in this specific case, linking to the heading would be better. However, https://gitlab.com/gitlab-org/gitlab/-/issues/462849 prevents me doing that. <!-- Label reminders Use the following resources to find the appropriate labels: - Use only one tier label choosing the lowest tier this is intended for - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
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