Fix more tables to use at least three hyphens

What does this MR do?

As pointed out in the issue, tables with short delimiter rows (only 1 or 2 hyphens per cell) aren't handled well by the translation service. So we can clean this up by using at least 3 hyphens, which seems to be an unofficial standard in some places. I mostly just auto-formatted these tables, though hand-formatted a few that were rather wide.

Related issues

• Related to gitlab-com/localization/docs-site-localization#49 (comment 2514636185)
• Related to #545096 (closed)

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