Force better alignment in tables

What does this MR do?

Rather than relying on natural word wrapping in the Markdown tables, this MR introduces some hard breaks so the left-most column is roughly aligned in all tables down the page.

Also fixes broken anchor link.

Related issues

Ports: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23393

Author's checklist

• Apply the correct labels and milestone
• Port the MR to EE (or backport from CE): always recommended, required when the ee-compat-check job fails

Review checklist

• Your team's review (required)
• PM's review (recommended, but not a blocker)
• Technical writer's review (required)
• Merge the EE-MR first, CE-MR afterwards