fix documentation as details block was hiding rest of the documentation

• fix documentation as details block was hiding rest of the documentation
• remove r3 release specific documentation

added Documentation label

added MRDocumentation Update label

changed milestone to %M18 - Release 0.21

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added 3 commits

• 862e11e7...a82c98ee - 2 commits from branch master
• f049cc8a - Merge branch 'master' into fix-documentation

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mentioned in commit 6ad44b4b

merged