Improve content quality score for the repo (part 2)

[davidbritch]

The content quality score for the repo in July was 79.31%. This needs bringing up to > 85%, and was achieved with last months work which brought the score up to 87.87%. Further improve the score this month.

Use the content quality report to make freshness passes of the most impactful topics (ranked by page views), that aren't classed as fresh.

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Associated WorkItem - 314353