docs - collections changes screenshots and UI text (#19958)

docs/administration-guide/06-collections.md

...nistration-guide/images/collections/collection-detail.png

...nistration-guide/images/collections/create-collection.png

.../administration-guide/images/collections/pinned-items.png

docs/users-guide/03-basic-exploration.md

docs/users-guide/07-dashboards.md

docs/users-guide/collections.md

docs/users-guide/images/basic-exploration/search-results.png

docs/users-guide/images/collection-detail.png

docs/users-guide/images/collections/official-collection.png

docs/users-guide/images/collections/our-analytics-page.png

docs/users-guide/images/collections/pinned-items.png

docs/users-guide/images/collections/question-checkbox.png

docs/users-guide/images/dashboards/pinning-dashboard.png