Remove consecutive blank lines from markdown files
What does this MR do?
As part of https://gitlab.com/gitlab-com/gitlab-docs/issues/287, remove unnecessary consecutive blank lines from the Markdown files in the doc suite.
Related issues
Relates to: https://gitlab.com/gitlab-com/gitlab-docs/issues/287
Author's checklist
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Apply the correct labels and milestone -
Port the MR to EE (or backport from CE): https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9568
Review checklist
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Technical writer's review (required) -
Merge the EE-MR first (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9568), CE-MR afterwards