Update metadata.md

docs/user-documentation/metadata.md

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 # Metadata in Islandora
 
-> TL;DR: In Islandora, metadata is stored in Drupal, in _fields_ attached to _entities_ (nodes or media). This allows us to interact with metadata (add, edit, remove, display, index in a search engine...) almost entirely using standard Drupal processes. If exporting this metadata to Fedora and/or a triplestore, the values are serialized to RDF using mappings that can be set for each bundle.
+> 1-minute synopsis: In Islandora, metadata is stored in Drupal, in _fields_ attached to _entities_ (nodes or media). This allows us to interact with metadata (add, edit, remove, display, index in a search engine...) almost entirely using standard Drupal processes. If exporting this metadata to Fedora and/or a triplestore, the values are serialized to RDF using mappings that can be set for each bundle.
 
 !!! note "Drupal 8 Terminology"
     In Drupal 8, Fields can be attached to _bundles_ (sometimes called _entity sub-types_ -- e.g. Content types, Media types, Vocabularies) or _entities_ (e.g. Users). For more on Fields, see ["2.3 Content Entities and Fields"](https://www.drupal.org/docs/user_guide/en/planning-data-types.html) and ["6.3 Adding Basic Fields to a Content Type"](https://www.drupal.org/docs/user_guide/en/structure-fields.html) in the Official Drupal Guide.