Enforce consistent prefix for numbered lists
Enforced another Markdown rule: https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md#md029---ordered-list-item-prefix, which aligns with our Styleguide for numbered lists: https://docs.gitlab.com/ee/development/documentation/styleguide.html#list-items.
Numbered lists should always be prefixed with 1.
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Relates to: https://gitlab.com/gitlab-com/gitlab-docs/issues/287. Related to https://gitlab.com/charts/gitlab/issues/1529
CC @gl-docsteam
Edited by Marcel Amirault