Style <details> elements in docs

Inactive Accountrequested to merge
winh-style-details-elements into master

This makes it easier to identify <details> elements in our docs.

Before After
details-style-old details-style-new

Test http://winh-style-details-elements.178.62.207.141.xip.io/ce/user/markdown.html#details-and-summary

Edited by Achilleas Pipinellis

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