fix and complete metadata setting docs#1167

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bernt-matthias wants to merge 3 commits intogalaxyproject:masterfrom bernt-matthias:topic/doc/metadata

+30-3

Commits on May 4, 2021

fix and complete metadata setting docs
bernt-matthias
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Commits on May 6, 2021

start to describe new metadata format
bernt-matthias
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Commits on Aug 5, 2021

added some links
bernt-matthias
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