docs: updated edge docs PE-2801 (#1655)

* docs:  updated edge docs PE-2801

* docs: updated the how-to with version 4.0.6

* Apply suggestions from code review

Co-authored-by: Rita Watson <117382432+ritawatson@users.noreply.github.com>

* Optimised images with calibre/image-actions

* Apply suggestions from code review

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Co-authored-by: Rita Watson <117382432+ritawatson@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>